Bill is ill,Do you know what‘s wrong with him?Poor boy.His i

Bill is ill,Do you know what‘s wrong with him?Poor boy.His illness is the of eating too much unBill is ill,Do you know what‘s wrong with him?Poor boy.His illness is the of eating too much unhealthy foodA reason Bcause Cresult Dend 为什么选C概括一下reason cause fesult 的用法,为什么不选A