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 :

Question

( A ) $400^{\circ}C$
( B ) $500^{\circ}C$
( C ) $200^{\circ}C$
( D ) $300^{\circ}C$