According to the law of conservation of energy, what can happen to the total energy of a system?
A. Energy must be transferred out of a system if energy is transferred
into the system so that they total energy of the system stays the
same.
B. The total energy can decrease when energy is lost due to energy
transformation within the system.
C. The total energy can increase if energy is transferred into the
system from surroundings.
D. The total energy must remain the same, but energy can change
forms and be transferred within the system.