2,000 kJ worth of heat is absorbs by each of the following objects. Which object will experience the smallest temperature change

The question has missing information! But, with the objects and their respectives masses and specific coefficiets and with the following explanation, the question can be aswered!

Answer:

The one which has the highest product of the mass by specific heat.

Explanation:

The heat is a way of "energy in motion", which means that is a way that energy can be exchanged between substances. This exchange occurs when there is a difference in the temperature of the substances that are in contact, and then, to achieve thermal equilibrium, one substance loses heat (the one with higher temperature) and had a decrease in temperature, and the other gain heat and had an increase of temperature.

The heat loss is the same heat gained, and it can be calculated. If the substance doesn't suffer a physical change (which is the case here), then:

Q = m*c*ΔT

Where Q is the heat, c is the specific heat, and ΔT is the temperature change. So, rearranged the expression:

ΔT = Q / (m*c)

Because Q is the same for all of the objects, the one that will experience the smallest temperature change is the one that has the highest value of m*c (because it is indirectly proportional to ΔT).