I am _____ about what I say because careless remarks are likely to hurt others' feelings．

A．enthusiastic

B．concerned

C．doubtful

D．cautious

明朝嘉靖年间，户部主事海瑞向深居西苑、潜心修道、不理朝政的皇帝上疏，直言其“竭民脂膏，滥兴土木，二十余年不视朝，法纪弛矣”。此举

A．意在规劝嘉靖皇帝遵守法律

B．履行监察部门的监督职责

C．体现了理学倡导的社会责任感

D．反映了君臣间的权力之争