Error Spotting – Identify the part of the sentence that contains a grammatical error (choose exactly one; select “No error” if the sentence is fully correct). Sentence: A) He could succeed B) in catching the ball C) before it reaches D) the boundary line.

Introduction:
This question checks tense consistency within a complex sentence describing a past outcome relative to another event.

Given Data / Assumptions:

• A uses "could succeed" implying past time or hypothetical capability.
• C uses simple present "reaches."
• Sequence intended: he succeeded before the ball reached the boundary.

Concept / Approach:
Maintain tense harmony. When the main clause indicates past or past ability, a time-related subordinate clause should align with past time unless a general truth is expressed (not the case here).

Step-by-Step Solution:
1) Main time frame: past/hypothetical indicated by "could succeed."2) Subordinate clause "before it reaches" should match the past frame.3) Replace with "before it reached."4) Correct sentence: "He could succeed in catching the ball before it reached the boundary line."

Verification / Alternative check:
Try present frame consistently: "He can succeed ... before it reaches ..." That also works, but then A would change to present. Original mix is the problem.

Why Other Options Are Wrong:

• A: Acceptable as past ability when paired with past subordinate tense.
• B: Idiomatic gerund phrase.
• D: Noun phrase is fine.

Common Pitfalls:
Mixing present and past within time-linked clauses without justification.

Final Answer:
Option C