题目 17 范文：支持 B（遗传与环境影响更大）
I agree with Paul that genetics and environment usually have a larger effect on mental health than exercise. Physical activity can improve mood, but it cannot remove an unsafe home, serious financial stress, discrimination, or an inherited risk of illness. These conditions affect people every day and may require professional treatment or social support. Claire is right that exercise is a healthy practice, yet telling everyone to exercise more can make a person with a serious condition feel responsible for something beyond their control. Communities should provide affordable counseling, safe housing, and strong support networks. Exercise can be one useful part of care, but lasting mental well-being depends more on the wider conditions in which a person lives.