OG 162

162. Concerned at the increase in accident fatalities,

Tennessee adopted a child-passenger protection law requiring the parents of children under four years of age to be restrained in a child safety seat.

(A)  the parents of children under four years of age to be restrained in a child safety seat

(B)   the restraint of parents of children under four years of age in a child safety seat

(C)  that parents restrain children under four years of age in a child safety seat

(D)  that children be restrained under four years of age in a child safety seat by their parents

(E)   children to be restrained under four years of age by their parents in a child safety seat

请问D哪里错了？