Consider the statements A, B, C on dolphin and choose the correct answer:A. Dolphins are found in the freshwater of river Ganga and Brahmaputra.B. Dolphin sanctuary is located in the state of Bihar.C. The presence of dolphins is an indicator of the health of the river.

• A. B and C are correct but A is incorrect
• B. A and B are correct but C is incorrect
• C. A, B, C all are correct
• D. A and C are correct but B is incorrect