[单选题]
A 5.0-nC charge is at (0, 0) and a :x qyswn/7c)p -2.0-nC chargkef *sgh; n 79wuz08yle is at (3.0 m, 0). If the potential is taken to be zero at infinity, what is the u8wslkz nf y0eh79* ;gelectric potential at point (0, 4.0 m)?
A. $15 \; V$
B. $3.6 \; V$
C. $11 \; V$
D. $7.7 \; V$
