24 POINTS!!!!!!!!!!!!!!

The first law of thermodynamics states that △E = Q-w. is this also a statement of the principle of conversation of energy?

AThe heat that flows into the system is transformed into work and a change in internal energy
BThe energy that flows into the system is transformed into heat and work
CThe work that is done by the piston is transformed into heat and a change in internal energy
DA change in internal energy causes work to be done and heat to flow into the system