单项选择题

A.85%乙醇90ml+40%甲醛10ml
B.90%乙醇90ml+40%甲醛10ml
C.95%乙醇90ml+40%甲醛10ml
D.80%乙醇90ml+40%甲醛10ml
E.75%乙醇90ml+40%甲醛10ml