A brownout occurs when an electric utility can’t supply enough power to meet demand. Rather than cut off some customers completely, the utility reduces the voltage across its system. Brownouts are most likely on hot summer days, when heavy air-conditioning loads drive up demand for electricity. In a particular brownout, the utility reduces the voltage by 10%.

Metallic conductors like lightbulb filaments and electric stove burners have resistance that increases with increasing temperature. During the brownout, the current in such devices 
a. decreases by 10%.
b. decreases by more than 10%.
c. decreases by less than 10%.
d. You can’t tell without knowing more about how the resistance varies