Hi there!
The answer would be B. The California sea lion appears childish on land.
Notice how earlier in the passage they are describing the funny features of the Cali Sea Lion. “... their heads are are doglike, and their necks are slender.” Indicating these animals make look funny on land. Then at the end of the passage it contradicts that earlier statement by saying despite how they look, they are very graceful underwater.
Hope this helps !