For Which of the Following Transitions in a Hydrogen Atom

Multiple Choice

For which of the following transitions in a hydrogen atom free of external fields does the electron energy increase?​

A) ​The electron moves from n = 2 to n = 1.
B) The electron moves from n = 3 to n = 5.
C) ​Within the n = 4,l = 2 sublevel,the electron moves from = -1 to = +1.
D) ​Within the n = 3 level,the electron moves from = 2 to = -2.