Which option correctly uses the past perfect tense?

Correct option is B

The correct option is (b).

The past perfect tense is used to show that one action was completed before another point in the past. The structure of past perfect is had + past participle (V3). In option (b), had finished clearly shows completion before the time mentioned.

Step-by-step reasoning:

• Past perfect structure: Subject + had + V3.
• Option (b) has had finished where finished is V3 of finish.
• The phrase by 6 PM indicates a deadline in the past, so past perfect is appropriate.

Why other options are incorrect:

• (a) I finish is simple present, used for habits or general truths.
• (c) I am finishing is present continuous, used for an action happening now/around now.
• (d) I finished is simple past, which states a completed action in the past but does not clearly show completion before another past point.

Information booster: Past perfect is often used with words like before, after, by the time, and already to show sequence of past events.

So the correct answer is (b)