Can someone please give me this answer to this please

In what direction does an applied force move an object

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2