题干

如图是中国历史纪年表(局部),其中的a、b、c、d指四个朝代,下列说法正确的是(  )

①a是我国封建社会的繁荣时期                                                ②b的都城在上京

③与c并立的两个政权是由契丹族建立的金和党项族建立的西夏      ④d的建立者是忽必烈

A:②④

B:①③

C:②③

D:①④

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D

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