Describe how you will tell your friends that Rohit helps Raghu in passive voice.

Correct option is B

To describe how you will tell your friends that Rohit helps Raghu in passive voice, the correct option is option (b) Raghu is helped by Rohit.
 In passive voice, the focus is on the receiver of the action (Raghu), and the doer of the action (Rohit) becomes less important or may not be mentioned at all.
 This construction effectively conveys that Rohit helps Raghu without emphasizing Rohit as the doer.