One Wrong Move

Q: what is black's best move that will keep black up by 4pts:

drive.google.com/open?id=0B4EcMwUT4KzdT0s2WFItaG5Fb1k

A. e6xf5
B. Ne7xf5
C. Ne7xNg6
D. Pat Buchanan
E. resign
F. cry
G. other

B. Take with a knigt, and the white knigt cannot escape.