问题：

[单选] When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect（）.

A . Both towheads will tend to drift apart，and the overtaking vessel will be slowed down
B . Both towheads will tend to drift together，and the overtaking vessel will be slowed down
C . Both towheads will tend to drift apart，and the overtaken vessel will be slowed down
D . Both towheads will tend to drift together，and the overtaken vessel will be slowed dow