EPIC conducted a research two years ago to______.A．prove that people should eat five porti

EPIC conducted a research two years ago to______.

A．prove that people should eat five portions of fruit a day

B．find a way to reduce the overall cancer risk

C．make sure the right amount of fruit eaten every day

D．investigate the relation between eating fruit and reducing cancer risk

请帮忙给出正确答案和分析，谢谢！