D Question 3 2 pts Which statement below regarding the First Law of Thermodynamics is most correct? O No matter what other interactions take place, the internal energy must change if a system undergoes a heat transfer. O The internal energy of a system cannot change if the heat transferred to the system is equal to the work done by the system. O The internal energy of a system that interacts with its environment must change. A system can do work externally only if its internal energy decreases. The only changes that can occur in the internal energy of a system are those produced by non-mechanical forces