The correct option is C Limited in quantity
Exhaustible resources, or non-renewable resources are those which cannot renew itself upon consumption, hence they are limited. Natural resources such as coal, petroleum (crude oil) and natural gas take thousands of years to form naturally and cannot be replaced as fast as they are being consumed. Use of these natural resources leads to their depletion. Inexhaustible resources include solar, wind and hydroelectric power, which naturally replenish, or timber and corn, which can be replenished.