DC emf of 15 V is applied to a circuit containing 5 H inductance and 10 $$\Omega$$ resistance in series at t = 0. The ratio of the currents in the circuit at t = 0.5 sec and at t = 1.0 sec is

A

$$\frac{e^2}{e^2 - 1}$$

B

$$\frac{\sqrt{e}}{\sqrt{e} -1}$$

C

$$\frac{e}{e + 1}$$

D

$$\frac{1}{e }$$