Which of the following is an example of induction?

Which of the following is an example of induction?
A、All mammals are warm-blooded. Whales are mammals. Therefore, whales are warm-blooded.
B、All birds have feathers. Eagles are birds. Therefore, eagles have feathers.
C、Some reptiles lay eggs. Snakes are reptiles. Therefore, snakes lay eggs.
D、All fish live in water. Goldfish are fish. Therefore, goldfish live in water.
【正确答案】：C