单项选择题

The passage mainly discusses _______.

A．division of labor between male and female mammals
B．how male are involved in the rearing process
C．how females choose their partners
D．factors affecting monogamy and polygamy

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单项选择题

According to the passage, male marmoset and tamarin monkeys ______

A．can't defend more than one female
B．practice monogamy
C．get more offspring
D．invest heavily in their partners and the young