[单选题]
A 5.0-nC charge is at (0, 0) and a -2.0-nC cha9 mb4*rn2i2qw;f s;smxdj( y8 v)vuct rge is at (3.0 m, 0)ipz9qv *wj 9q5. If the potential is taken to be zero at infinity, what is the electric potential at poi i *jqz95wvq9pnt (0, 4.0 m)?
A. $15 \; V$
B. $3.6 \; V$
C. $11 \; V$
D. $7.7 \; V$