单项选择题

The elephant is the biggest four-legged animal in the world. It is also, perhaps, the gentlest; but not always!
Elephants are like us in some ways. They live for a long time --- fifty or sixty years. They can remember things very well. They never forget great sadness or great happiness. When a female elephants dies, her daughters and
grandmothers are sad for many months. They stay with the dead body. Then they carry a bit of it away with them. They never forget a dead friend.
Elephants are like us, but they are also different. They live in families, families of females. There will be a few young males --- a few “baby boys”. But the females will soon send them away. An elephant family keeps only its daughters, mothers, grandmothers and its great-grandmothers. The females stay together for fifty, sixty … a hundred years. The older animals look after the younger ones. The mothers teach their daughters and set a good example. And what happens to male elephants Well, the young males stay with their mothers for a time. Then they must leave family. The females just send them away. A bull (雄的) elephant does not often have a friend. He lives apart away from the family, and often away from other bulls.
Sometimes the females call a bull. He can visit them then, and stay for a time. But soon his “wives” and sisters send him away again. The females have very happy family life. What does the bull think about it We don’t know.

Which of the following is TRUE according to the passage()

A.Sometimes the female elephants visit a bull elephant.
B.Sometimes the younger females stay with the family for a time.
C.When a female elephant is old, the males leave the family.
D.A bull elephant sometimes stays with females for a time.