A sentence, or part of the sentence, is underlined in the actual question. Four alternatives are given to improve the underlined part. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement". The sentence is: "He is a fast bowler of repute, but his yesterday's performance was not up to the mark."

Introduction / Context:
This question tests sentence improvement with a focus on natural, idiomatic English. The sentence describes a cricket bowler's performance on the previous day: "He is a fast bowler of repute, but his yesterday's performance was not up to the mark." You must decide whether the underlined phrase is correct or if one of the alternatives provides a better, more grammatical expression.

Given Data / Assumptions:

The key phrase under examination is "his yesterday's performance".
The sentence contrasts his general reputation with his performance on a particular day.
We assume this is standard exam English and that the focus is on idiomatic usage rather than highly informal speech.
Any replacement must preserve the meaning that the performance took place the previous day.

Concept / Approach:
In English, the genitive form yesterday's performance is a natural and accepted way to refer to performance on the previous day. The possessive 's attaches to yesterday to form an attributive phrase. When combined with his, the phrase his yesterday's performance is slightly formal but acceptable in exam-style English, especially because it mirrors structures like his Monday's performance. The suggested alternatives either drop the possessive incorrectly or create unidiomatic expressions such as performance for yesterday.

Step-by-Step Solution:
Step 1: Identify the meaning: the sentence wants to say that the fast bowler's performance on the previous day was poor. Step 2: Check the original phrase "his yesterday's performance". It uses his to show whose performance and yesterday's to show when. Step 3: Examine option A "performance for yesterday". This sounds awkward and is not standard; we usually say yesterday's performance. Step 4: Option B "yesterday performance" omits the possessive 's and sounds incorrect; the usual form is yesterday's performance. Step 5: Option C "performances for yesterday" is plural and changes the meaning, making it sound as if several performances belonged to yesterday. Step 6: Option E "performance of yesterday" is clumsy and less natural than yesterday's performance in modern usage.

Verification / Alternative check:
Consider how we speak about events on specific days: yesterday's match, yesterday's news, yesterday's meeting. We rarely say news of yesterday or meeting for yesterday in normal conversation. Therefore, yesterday's performance is the idiomatic pattern. Adding his simply shows possession: his yesterday's performance, although slightly wordy, is grammatically acceptable in exam English. None of the alternatives improves the sentence; in fact, they all sound less natural.

Why Other Options Are Wrong:
Option A performance for yesterday wrongly uses the preposition for, making the phrase sound like a schedule or allocation rather than a description of an event that has already occurred.
Option B yesterday performance lacks the possessive 's, which is needed for natural phrasing; we say yesterday's performance instead.
Option C performances for yesterday changes the number and complicates the meaning by implying multiple performances on that day.
Option E performance of yesterday is grammatically possible but stiff and unidiomatic compared with yesterday's performance, which examiners prefer.

Common Pitfalls:
Test takers sometimes overcorrect natural expressions, thinking that Common exam sentences must be changed even when they are already correct. Always check whether the original expression is genuinely wrong before selecting another option. Remember that genitive forms like yesterday's, last year's, or Monday's are very common in English and should not be replaced with awkward prepositional phrases unless clearly required.

Final Answer:
The original phrasing is acceptable and idiomatic, so the correct choice is No improvement.