单项选择题

A.抗-A效价≥256;抗-B效价≥256
B.抗-A效价≥256;抗-B效价≥128
C.抗-A效价≥128;抗-B效价≥128
D.抗-A效价≥128;抗-B效价≥64
E.抗-A效价≥64;抗-B效价≥64