The teacher's advice was acted upon by them.The given sentence is the
A. They were acting on the teacher’s advice.
B. They acted on the teacher’s advice.
C. They acted upon the teacher’s advice.
D. They had acted upon the teacher’s advice.
Right Answer is: C
The given sentence is the passive form of simple past tense. The structures for passive/active voices are:
Passive: Object + was/were + verb (IIIrd form) + by + subject…
Active: Subject + verb (IInd form) + object…
The verb in this sentence is a prepositional verb since it carries preposition “upon” with it. While changing the voice of the sentence, we do not drop the preposition and it remains unchanged. So, with the help of the above structures, we can convert the given sentence into active voice:
They acted upon the teacher’s advice.