In the following English grammar question, a sentence is given in which a part is underlined. Four alternatives are provided for the underlined words. Choose the option that best improves the sentence. If no improvement is required, choose the option labeled "No improvement". The sentence is: Herself saw the thief.

Introduction / Context:
This grammar question tests the correct use and position of a reflexive or emphatic pronoun in a simple English sentence. The aim is to express clearly that the subject personally saw the thief, using natural, standard English word order that appears often in competitive examinations and formal writing tasks.

Given Data / Assumptions:

• Original sentence: Herself saw the thief.
• The underlined part is the clause containing the word "Herself".
• We must choose the alternative that produces a grammatically correct and idiomatic sentence.
• The context is a statement in the past about a person who personally witnessed a thief.

Concept / Approach:
In English, reflexive pronouns like "myself", "yourself", and "herself" are used either as objects of a verb or preposition, or as emphatic pronouns to stress a subject. When used for emphasis, the pronoun normally follows the subject: "She herself saw the thief." Starting a sentence with "Herself" without an explicit subject is ungrammatical in standard English and sounds incomplete or fragmented.

Step-by-Step Solution:
Identify the subject that performs the action. Here the implied subject is "she".Recognise that the intention is to emphasise that this subject personally saw the thief.In English, an emphatic pronoun is placed after the subject: "She herself".Place the verb after the subject and emphatic pronoun: "She herself saw the thief."Check that tense, word order, and meaning are all correct and natural.

Verification / Alternative check:
Read the corrected sentence aloud: "She herself saw the thief." It now has an explicit subject ("She"), correctly uses "herself" as an emphatic pronoun, and maintains the simple past verb "saw". The meaning is clear and unambiguous, and the sentence fits standard formal usage found in exam passages and grammar books.

Why Other Options Are Wrong:
Option A: "Herself she saw the thief." places "Herself" awkwardly at the beginning and then repeats "she", creating an incorrect and clumsy structure. Option C: "Herself she see the thief." has the same word order problem and also an incorrect verb form "see" instead of "saw" for past time. Option D: "No improvement" is wrong because the original sentence without "she" is clearly ungrammatical.

Common Pitfalls:
Many learners try to begin sentences with a reflexive pronoun because they translate directly from their first language or because they want to add emphasis. However, in English the subject still needs to be stated clearly, and emphasis is shown by placing the reflexive pronoun after that subject. Another common error is mixing emphatic and reflexive use without understanding their function, which leads to strange or incomplete sentences.

Final Answer:
The correct improved sentence is She herself saw the thief.