Sawi presented Rani with a necklace.
Change the above sentence into passive voice.

When a verb's subject (in a sentence) also performs the action in the verb, the verb is said to be in the Active Voice. When the verb's subject (in the sentence) receives the action named in the verb, the verb is said to be in the Passive voice. According to the rule on changing active voice into passive, if a sentence is in past indefinite tense, to convert into passive the given sentence must change into past continuous tense. Therefore, options both A and option B are correct.