PP 1-134 求教 幫幫忙~~

Among lower-paid workers, union members are less likely than nonunion members to be enrolled in lower-end insurance plans imposing stricter limits on medical services and requiring doctors to see more patients, and spend less time with each.

(C)  that impose stricter limits on medical services, require doctors to see more patients, and spend

(D)  that impose stricter limits on medical services and require doctors to see more patients, spending

(E)  that impose stricter limits on medical services, requiring doctoes to see more patients nad spending

Answer : D

請問這三個選項之間的小小差異要如何排除呢

感激