Question

the thermal energy of matter depends on its _______.
a mass.
b temperature.
c number of particles.
d all of the above.

Explanation:

Thermal energy (also called internal energy) of a substance depends on multiple factors. Mass (or number of particles, since mass is related to the amount of matter/particles) affects thermal energy—more mass means more particles, so more total kinetic energy of particles. Temperature is a measure of the average kinetic energy of particles, so higher temperature means higher average kinetic energy, thus more thermal energy. The number of particles (related to mass) also matters—more particles mean more total energy. So thermal energy depends on mass, temperature, and number of particles, so "all of the above" is correct.

Answer:

d. all of the above.