They love their daughter so much that they are always ready to do everything they can ________ her happiness.

A．to make sure of

B．make sure of

C．be sure of

D．to be sure of

有关处方药与非处方药的叙述，正确的是

A．处方药只能凭执业医师的处方才可调配、购买

B．消费者需凭处方才能购买非处方药，但可自行使用非处方药

C．处方药和非处方药是药品本质上的属性

D．处方药和非处方药均需经过国家工商管理部门批准

E．处方药和非处方药的安全性和有效性都是有保障的