An Infinite Plane of Charge With $\sigma = + 55.5 \frac { p C } { \mathrm {~m} ^ { 2 } }$

Multiple Choice

An infinite plane of charge with $\sigma = + 55.5 \frac { p C } { \mathrm {~m} ^ { 2 } }$ is tilted at a 45 $\degree$ angle to the vertical direction as shown below.The potential difference,V_A -V_B,in volts,between points A and B,a 4.50 m distance apart,is

A) -7.06.
B) -9.98.
C) -14.11.
D) +7.06.
E) +9.98.