The internal energy of a substance is defined as   A)…

The internal energy of a substance is defined as   A) the potential energy of all particles which make up the substance. B) the kinetic energy of all particles which make up the substance. C) the sum of the potential and kinetic energy of all particles which make up the substance.     D) the thermal energy of all particles which make up the substance. E) the chemical energy of all particles which make up the substance.