10) A

The second paragraph says that “assessed the monkeys’ preference for each toy by measuring how much time they spent with each. So clearly, in order to prove that sex preference does occur in monkeys, the time spent with each toy must be an  indicator of how much they are interested in the toy.

A – Correct
A paraphrases the assumption mentioned above correctly.

B – Wrong

Genetic makeup being alike in both species is not assumed in the text.

C – Wrong
A doll and a cooking pot were chosen only because they were stereotypically feminine toys.

D – Wrong
This is not necessarily assumed.

E – Wrong
This is not necessarily assumed.

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