Change the following from active to passive:
The manager was giving the staff detailed instructions at the time of the disruption.

Correct option is B

The correct active/passive voice of the given sentence is ( b).
Explanation: The original sentence is in past continuous (was giving). To form the passive of past continuous, use was/were being + past participle. Because the new subject “the staff” is plural, we choose were being given. The verb “give” is ditransitive (two objects: the staff [indirect] and detailed instructions [direct]); in passive, either object can become the subject. Option (b) correctly preserves tense, aspect, and both objects: The staff (indirect object) become the subject, and detailed instructions remain after the verb. The time phrase at the time of the disruption is also retained.
Structure:
Active voice: Subject + was/were + V-ing + object(s)
Passive Voice: Object + was/were being + V³ + (by + agent)
Example: She was writing a letter → A letter was being written by her.
Information booster: With double objects, you may also passivize the direct object: Detailed instructions were being given to the staff by the manager… (also correct, but not among the options).