A resistance $$R$$ and a capacitance $$C$$ are connected in series to a battery of negligible internal resistance through a key. The key is closed at $$t = 0$$. If after $$t$$ sec the voltage across the capacitance was seven times the voltage across $$R$$, the value of $$t$$ is

A

$$3RC\ln 2$$

B

$$2RC\ln 2$$

C

$$2RC\ln 7$$

D

$$3RC\ln 7$$