单项选择题

A.WBC< 1*109/L,PLT< 50*109/L
B.WBC< 2*109/L,PLT< 60*109/L
C.WBC< 3*109/L,PLT< 70*109/L 
D.WBC< 4*109/L,PLT< 80*109/L
E.WBC< 5*109/L,PLT< 90*109/L