Voltage rating of a parallel plate capacitor is 500 V. Its dielectric can withstand a maximum electric field of 10⁶V/m. The plate area is 10⁻⁴m². What is the dielectric constant is the capacitance is 15 pF?

(given ∊₀ = 8.86 × 10⁻¹²C²/Nm²).

A. 8.5
B. 3.8
C. 4.5
D. 6.2