In this question, we are given three statements about different rivers. We need to determine which of these statements are correct.

Statement 1: The Sharavati river creates Jog Falls.

This statement is correct. Jog Falls is created by the Sharavati river, which is located in the Shivamogga district of Karnataka, India. Hence, statement 1 is correct.

Statement 2: The Brahmani river is formed by the confluence of the Kosi and Sankh rivers.

This statement is incorrect. The Brahmani river is actually formed by the confluence of the Sankh and Koel rivers, not Kosi. The Brahmani river flows through the states of Odisha and Jharkhand in India. Hence, statement 2 is incorrect.

Statement 3: The Tamraparni is a river of Tirunelveli district of Tamil Nadu.

This statement is correct. The Tamraparni river is indeed a river located in the Tirunelveli district of Tamil Nadu, India. Hence, statement 3 is correct.

Based on our analysis, out of the three statements, statement 1 and statement 3 are correct. Therefore, the correct answer is option 2.