It was not rare in _____ that people in _____ fifties went to university for further education. [ ]

A.1980s; their

B. the 1980s; the

C. the 1980s; their

D. 1980s; the

全面结算会员期货公司和交易结算会员期货公司应当按照（）的规定行使结算会员的权利，履行结算会员的义务。

A.《期货交易所管理办法》

B.《企业会计准则》

C.《期货交易所交易规则及其实施细则》

D.《期货经纪公司管理办法》