A donkey may permit himself to fall under his burden， but not a human being， the best of creation.

A donkey may permit himself to fall under his burden， but not a human being， the best of creation.
A、...a human being should not fail like a donkey.
B、...a human being should not behave like a donkey.
C、...a human being should forever strive for a better life.
D、...a human being should not give up under harsh conditions.
正确答案：D