Why does the author mention young elephants' attempts to drink with their trunks in paragraph 4?
A.
To argue that elephants must be intelligent in order to use their trunks.
B.
To show that baby elephants would surely die without their mothers' help.
C.
To provide an example of an instinctual behavior. inherent in elephants.
D.
To emphasize how important learning is in the lives of elephants.