When vibrational motion in an object increases, which is a true statement?

a.
kinetic energy and temperature decrease; thermal energy increases.

b.
kinetic energy, temperature, and thermal energy decrease.

c.
kinetic energy and temperature increase; thermal energy decreases.

d.
kinetic energy, temperature, and thermal energy increase.

i think its d, but im not sure.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.