It wasn’t unusual to find tens of computers within a company infected by a virus transmited via email ______.A.attraction B.attachment C.affection D.friendship

It wasn’t unusual to find tens of computers within a company infected by a virus transmited via email ______.
A.attraction B.attachment C.affection D.friendship

B.attachment
正确答案应是 email attachment,即电邮附件

B附件

C affection 感染， 影响