Answer:
Option c
Explanation:
A sentence is said to be in active voice if the subject acts upon its verb whereas a sentence is said to be in passive voice if a subject is a recipient of a verb's action.
The given sentence is in the passive voice.
Passive voice: The difficult sonata was played by the talented pianist.
In active voice, this sentence can be written as follows:
The talented pianist played the difficult sonata.
Therefore,
Option c
