Specific heat is

A.The amount of heat required to raise the temperature of a unit quantity of substance through 1?C
B.The amount of heat requred to change the state or condition under which a substance exists without changing its temperature
C.The ratio of quantity of heat required to raise the temperature of a given weight of any substance through 1?C to the quantity of heat required to raise the temperature of same weight of water through 1?C
D.The heat sensed by a mercury thermometer
E.None of the above