English Grammar – Spot the Error (choose the segment with the mistake; if there is no mistake, choose ‘‘No error’’). Sentence: “Even after worked in the office for as many as fifteen years, he still does not understand the basic objectives of the work.”

Introduction / Context:The focus here is the correct non-finite form after a preposition. After “after”, we typically use a gerund/gerund-participial form (“working”), not a past participle by itself (“worked”) unless it forms part of a reduced clause with “having worked”.

Given Data / Assumptions:

• Preposition: “after”.
• Verb form used: “worked”.
• Intended meaning: duration of employment prior to the current evaluation.

Concept / Approach:

• Correct patterns: “after working …” or “after having worked …”.
• Therefore, Segment A must change to “Even after working in the office …”.
• The adverbial intensifier “as many as fifteen years” is acceptable emphasis.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer: