the internal energy is the total kinetic energy and energy of all particles that make up a system. what word completes the sentence?

d is the correct answer

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

hypothesising or postulating

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.