An excited He + ion returns to the ground state by emitting a series of three photons,

Question:

An excited He⁺ ion returns to the ground state by emitting a series of three photons, with wavelengths of 26 nm, 469 nm, and 1014 nm. The process is represented in the energy level diagram below. Which arrow (A, B, or C) in the diagram represents the 1014-nm light?

A B C