Select the correct active form of the given sentence.
"The dining hall was being thoroughly cleaned by the workers."

Correct option is B

The correct active/passive voice of the given sentence is (b).
Explain the rules:
· Passive (past continuous): was being + past participle → Active (past continuous): were/was + verb-ing.
· The agent (“by the workers”) becomes the subject (“The workers”).
· The subject of passive (“The dining hall”) becomes the object in active.
· Structure:
· Passive: Subject + was/were being + V³ (+ by + Agent)
· Active: Agent (now Subject) + was/were + V-ing + Object
· Conversion: The dining hall was being cleaned by the workers → The workers were cleaning the dining hall thoroughly .