According to the passage, which of the following factors does NOT help improve digestion？A

According to the passage, which of the following factors does NOT help improve digestion？

A．More calories provided by meat-based diet.

B．Increased softness of food which reduces the energy needed to digest.

C．Bacteria contained in large intestine.

D．Starch and protein molecules being made easier to break down.

请帮忙给出正确答案和分析，谢谢！