Context: Humpback whales are found in the world's oceans. They live underwater, but come to the surface to breathe air.
The  has flippers for limbs. Its limbs are adapted for swimming.
Figure: humpback whale.
Which animal's limbs are also adapted for swimming?
A. nilgai
B. California sea lion
Determine the correct option from the provided choices and reply with its corresponding letter.

B