How is mechanical energy calculated?

a.) the amount of kinetic energy multiplied by the number of moving parts

b.) the sum of potential energy and kinetic energy

c.) the sum of kinetic energy that is being used to do work

d.) the difference between kinetic energy and potential energy

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .

i think the answer is composed of atoms