[单选题]
A 5.0-nC charge is at (0, 0) and a -2.0-nCx d6(f.8 cn5,igvf r wkqa gek;xu6;.u charge is lv psq4;jmp :d(h-ti(at (3.0 m, 0). If the potential is taken to be zero at inf4 pvlqsp;( :i-d mjht(inity, what is the electric potential at point (0, 4.0 m)?
A. $15 \; V$
B. $3.6 \; V$
C. $11 \; V$
D. $7.7 \; V$
