The Sub- Atomic Particle Known as the "Neutrino" Was Originally

The sub- atomic particle known as the "neutrino" was originally hypothesized

A) in order to preserve the law of conservation of energy in a certain type of nuclear process.
B) because it was thought that thermal energy (or heat) is actually a form of energy.
C) in order to preserve Newton's laws in a certain type of nuclear process.
D) in order to preserve conservation of electric charge in a certain type of nuclear process.
E) because it was thought that radiant energy is actually a form of energy.