48. If the displacement current in a parallel-plate capacitor (0.5 µF) is 4.0 A, at what rate is the potential difference varying across theplates?
(A) 2.0 × 106 V/s
(B) 8.0 × 106 V/s
(C) 4.0 × 106 V/s
(D) 1.25 × 107 V/s
(E) The potential difference is not varying