对某患者静脉滴注单室模型药物，已知该药的t1/2=9h，V=100L，若要使稳态血药浓度达到3μg／ml，则K0等于

A.50.42mg／h

B.100.42mg／h

C.109.42mg／h

D.120.42mg／h

E.121.42mg／h