I want to send an email to him, ______ I don't know his website. [ ]

A. and

B. so

C. or

D. but

女青年甲明知自己的男友乙杀了人，而帮助乙将杀人的匕首藏至自家的衣柜内并帮乙洗干净血衣。甲的行为

A．不构成犯罪

B．构成窝藏罪

C．构成包庇罪

D．构成杀人罪的共犯