Hi,
I answered this reading section, but I had problem with some answer keys, would you please check that?

4. Which of the sentences below expresses the essential information in the highlighted sentence in paragraph 2? Incorrect choices change the meaning in important ways or leave out essential information.
A. Biological theories of aggression emphasize its instinctive nature.
B. Theories that consider aggression biological are more accepted than those that consider it learned.
C. Various theories about aggression attribute it to either natural or learned causes.
D. Various theories try to compare the idea that aggression is biological with the idea that it is learned.
Thanks.