Given the Three Statements Below, Which Answer Is Best

Multiple Choice

Given the three statements below, which answer is best?
I. Although the wavelength of light and the frequency of light can change, the energy remains constant.
II. An important consequence of quantum theory is that the energy of various electronic states for atoms are at fixed discrete levels.
III. The energy of an electronic state for a hydrogen atom is dependent only on the principal quantum number n.

A) I and II are true, III is false
B) II and III are true, I is false
C) I and III are true, II is false
D) all are true
E) all are false