The Energy Expressions for the Electrons in the He⁺ Ion

Multiple Choice

The energy expressions for the electrons in the He⁺ ion and the hydrogen atom are E_n (H) = -a/n² and E_n (He⁺) = -4a/n²
Which of the following statements is(are) correct?
I. For the transitions , the frequency is larger for H than for He+.
II. The first ionization energy of the H atom is smaller than the second.
III. The 1s orbital in He+ is larger (in the sense that the probability density is
shifted outward) than the 1s orbital in H.

A) III only
B) I and II only
C) I only
D) I, II, and III
E) II only