Which choice describes how energy is transferred at the particle level through the process of conduction?

a. the fast-moving particles in the colder material collide with the slow-moving particles in the hotter object. the collisions transfer energy from the fast-moving particles to the slow-moving particles, increasing their speed and thermal energy.

b. the fast-moving particles in the hotter material collide with the slow-moving particles in the colder object. the collisions transfer energy from the fast-moving particles to the slow-moving particles, increasing their speed and thermal energy.

c. the fast-moving particles in the colder material move into the hotter material. the slow-moving particles in the hotter material move into the colder material. the two materials switch temperatures.

d. the fast-moving particles in the hotter material move into the colder material. the slow-moving particles in the colder material move into the hotter material. the two materials switch temperatures.