Answer:
Substance B
Step-by-step explanation:
Heat capacity is a measure of how much energy is needed to raise the temperature of an object.
A high heat capacity means that an object requires large amounts of heat energy to change/increase its temperature. It can take in a lot of heat energy before it starts changing temperature.
A low heat capacity means that an object requires a minimal amount of heat energy to change/increase its temperature. It can start changing more rapidly as compared to objects with higher heat capacities.
So, if the same amount of heat is added to both substances (Substance A and Substance B), the substance that will increase in temperature more rapidly is Substance B.