Vibheeshana was the brother of Ravana's father.
B
Correct answer
Explanation
Vibhishana was Ravana's younger brother, not Ravana's father's brother. They shared the same father (sage Visrava) but had different mothers, making them half-brothers. Ravana's father (Visrava) also had other sons including Kubera (from a different mother), but Vibhishana was not an uncle to Ravana.