Jake and His Sister Fight Constantly

Jake and his sister fight constantly.According to Trivers' theory,how should this behaviour be characterized?

A) Somewhat abnormal,since brothers and sisters share genetic material.
B) abnormal,given that it is a brother-sister pair and not two brothers or two sisters.
C) normal,because each sibling wants the limited resources that the parents can offer.
D) normal,because as children age they fight to get the attention of the parents.

Correct Answer:

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