The substance is most likely iron.
It looks as if we should calculate the specific heat capacity of the substance.
The formula for the amount heat
#color(blue)(bar(ul(|color(white)(a/a)q = mCΔTcolor(white)(a/a)|)))" "#
You can rearrange the formula to calculate the specific heat capacity:
#C = q/(mΔT)#
In this problem,
The Engineering Toolbox lists the following specific heat capacities of metals:
I will go for the one in the middle and say that the substance is most likely iron.