The problem given below consists of a question and two statements numbered I and II. You have to decide whether the data provided in the statements are sufficient to answer the question.

How many sisters does Sunny have?

I. Sunny is the only son of his parents.
II. Sunny's parents have three children.

Statements I and II together are sufficient to answer the question.

The correct answer is Option (3) → Statements I and II together are sufficient to answer the question.

I. Sunny is the only son of his parents. ( Does not give information about number of children of sunny's parents. Only provides information of single boy child )
II. Sunny's parents have three children. ( It is giving information about sunny's sisters, so he has two sisters.)