The resistance of a bulb filament is $$100\,\Omega$$ at a temperature of $$100^\circ C$$. If its temperature coefficient of resistance be $$0.005$$ per $$^\circ C$$, its resistance will become $$200\,\Omega$$ at a temperature of

A

$$200^\circ C$$

B

$$300^\circ C$$

C

$$400^\circ C$$

D

$$500^\circ C$$