This is _____ book. But where is mine?[ ]

A. him

B. his

C. he

D. himself

周武王认为，当发生以下哪种情况时，是攻打商国的好时机？（）

A.商国宫廷乱成一团时

B.商国百姓怨声载道时

C.商国百姓沉默不语时

D.商国官员横行霸市时