Correct option is A
The correct passive voice is
(a).
Active Voice: When the subject of the sentence performs the action, the sentence is in active voice.
Passive Voice: When the subject of the sentence receives the action, the sentence is in passive voice.
Structure (Present Simple):
Active: Subject + V1 + Object
Passive: Object + is/are + V3 + by + subject
Example: She writes letters. → Letters are written by her.
So: Nidhi draws the diagrams → The diagrams are drawn by Nidhi.
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Information Booster: Use
is/are + V3 for passive voice in present simple tense.