At what temperature does an object have more energy in its thermal store?

An object has more energy in its thermal store when it is hot because thermal energy is related to the temperature of the object. As the temperature of an object increases, the particles within it move more rapidly, which in turn increases the kinetic energy of those particles. This increase in kinetic energy translates directly to an increase in thermal energy.

At higher temperatures, the average kinetic energy of the particles is greater, leading to a higher thermal energy content for that object. Conversely, at lower temperatures, the motion of the particles slows down, resulting in less energy in the thermal store. Therefore, a hot object is the one with the most thermal energy among the options provided.