When a writer does not know who performed the action in a sentence, the writer can still write a grammatically correct sentence by

using the active voice.
using the passive voice.
ending the sentence with an infinitive.
ending the sentence with a preposition.

Using the passive voice

Explanation:

Ex:

Rice is grown in China.  (You don't know who grew the rice.)

Based on the information given, the passive voice can be used by the person.

A passive voice simply means the form of verb where the subject undergoes the action of the verb.

In a situation where the writer does not know who performed the action in a sentence, then the writer can still write a grammatically correct sentence by using the passive voice.

Learn more about passive voice on:

link

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the correct answer is c.

give me brainliest if it is correct!