Dr. Wrangham conducted the experiment on rats which did not rely on cooking because______.

Dr. Wrangham conducted the experiment on rats which did not rely on cooking because______.

A．increased weight is not caused by overeating cooked food

B．rats in the nature never eat cooked food

C．he wanted to test whether the softness of food alone would affect absorption

D．rats would overeat cooked food

请帮忙给出正确答案和分析，谢谢！