The Specific Colors of Light Emitted by an Atom in a Hot,thin

Multiple Choice

The specific colors of light emitted by an atom in a hot,thin gas (e.g. ,in a tube in a laboratory or a gas cloud in space) are caused by

A) the vibrations of the electrons within the atom.
B) an electron dropping into the nucleus and causing changes in the energy of the nucleus.
C) electrons jumping to lower energy levels,losing energy as they do so.
D) protons jumping from level to level.