The first law of thermodynamics states that δe=q-w. how is this also a statement of the principle of conservation of energy?

a. the work that is done by the piston is transformed into heat and a change in internal energy

b. a change in internal energy causes work to be done and heat to flow into the system

c. the heat that flows into the system is transformed into work and a change in internal energy

d. the energy that flows into the system is transformed into heat and work