Identify the segment in the sentence which contains a grammatical error.
Prior to this assignment, he work as an officer in the accounts department.

Correct option is A

Option (a) contains an error.
· The verb “work” is incorrectly used in present form. Since the sentence refers to a past action, the verb should be in the past tense.
· Correct usage: “he worked”
· Thus, the correct sentence is:
· “Prior to this assignment, he worked as an officer in the accounts department.”
Grammatical rule used:
When an action happened in the past and is completed, use Simple Past Tense:
Subject + V2 (past form)
Example: He visited the museum last week. (NOT “visit”)
Information Booster:
In time expressions like “prior to”, “last year”, “yesterday”, etc., always use the simple past unless the sentence indicates continuity or result in the present.