Select the correct active form of the given sentence.
A party was organized by Rayan on his 40th Birthday.

Correct option is A

The correct active form is "Rayan organized a party on his 40th Birthday."
This correctly converts the passive voice to active while retaining the original meaning.
Conversion rule:
Subject + V2 + object. -> <- Object + auxiliary verb (was, were) + past participle + by + subject.