The electric field in a certain region is given by `E=5 hat(i)-3hat(j) kv//m`. The potential difference `V_(B)-V_(A)` between points a and B having coordinates (4, 0, 3) m and (10, 3, 0) m respectively, is equal to
A. 21 kV
B. `-21 kV`
C. `39 kV`
D. `-39 kV`
