After ________ careful consideration, they finally decided that each child will be offered ________ university education.

A．the; a

B．不填；an

C．a; an

D．不填；a

唐朝刘禹锡诗：“朱雀桥边野草花，乌衣巷口夕阳斜。旧时王谢堂前燕，飞入寻常百姓家。”类似王、谢这些世家大族的没落，与下列制度的实行有直接关系的是[ ]

A、三省六部制

B、均田制

C、察举制

D、科举制度