If `R_(1)` and `R_(2)` are respectively the filament resistances of a 200 watt bulb and 100 watt bulb designed to operate on the same voltage, then
A. `R_(1)` is two times `R_(2)`
B. `R_(2)` is two times `R_(1)`
C. `R_(2)` is four times `R_(1)`
D. `R_(1)` is four times `R_(2)`
