Then I have learned there are a lot of troubles in our lives, but the problem is __________ they control you or you control them.

A．why

B．whether

C．that

D．what

广东农村信用社人民币个人结算账户（有折）开户的业务受理中，应指引客户填写以下哪一项文件？（）

A.《客户重要空白凭证购买（交回）单》

B.《重要空白凭证出售登记簿》

C.《撤销银行结算账户申请书》

D.《开立个人银行结算账户申请书》