Change the following from active to passive:
The internal task force was to have reviewed departmental compliance by the end of Quarter 3.

Correct option is B

The correct active/passive voice of the given sentence is (b).
Explain the rules of conversion (with structure):
· Active voice (given): Subject + be to + have + V₃ + Object + (Time)
· The internal task force (Subject) + was to have reviewed (be to + perfect infinitive) + departmental compliance (Object) + by the end of Quarter 3.
· Passive voice (required): Object → Subject + be to + have been + V₃ + by + Agent + (Time)
· Departmental compliance + was to have been reviewed + by the internal task force + by the end of Quarter 3.
Why (b) is correct:
· Passive perfect infinitive after be to = to have been + V₃ (to have been reviewed).
· Maintains the same time/expectation nuance: an action expected/ scheduled to be completed by a deadline.
Why the others are incorrect:
· (a) was to were been — ungrammatical auxiliary sequence.
· (c) was to had reviewed — wrong perfect construction; should be to have reviewed/to have been reviewed.
· (d) was to be reviewed — loses the perfect aspect (to have been reviewed) and thus the “by the end of Quarter 3” completed-by nuance.
Structure:
· Active: S + be to + have + V₃ + O (+ time)
· Passive: O + be to + have been + V₃ + by + S (+ time)
Example:
Active: The committee was to have finalized the report by Friday.
Passive: The report was to have been finalized by Friday (by the committee).