Correct option is A
The correct passive voice of the sentence is (a).
Explanation: In the passive voice, the object (“a challenging assignment”) becomes the subject, and the present perfect form “has given” becomes “has been given.” The agent “by Perumal” is retained.
Grammatical Rule Used:
For converting present perfect active sentences to passive, use “has/have been” + past participle of the verb.
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Corrected Sentence: “A challenging assignment has been given by Perumal to the newly admitted students.”
Explanation of other options:
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(b): Incorrect, as “will have been” changes the tense unnecessarily.
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(c): Incorrect, as “was given” changes the tense to simple past.
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(d): Incorrect, as “had been” changes the tense to past perfect.