Which of the following statements is INCORRECT？A．Exercise could reduce the risk of getting

Which of the following statements is INCORRECT？

A．Exercise could reduce the risk of getting Alzheimer.

B．Exercise could improve cognitive function.

C．Interconnection of nerve cells primarily benefits memory function.

D．The brain functions better with interconnection of nerve cells.

请帮忙给出正确答案和分析，谢谢！