During a brown-out, the electric power company drops the voltage of the power line and the incandescent

Question

light bulbs in your house become dimmer. When this happens, the filaments in the bulbs operate at a
lower than normal temperature, so

a. their color is somewhat bluer than normal.
b. they emit ultraviolet light.
c. their color is the same as normal, but they are less bright.
d. their color is somewhat redder than normal.
e. they burn out more quickly.