Consider the Following Portion of the Energy-Level Diagram for Hydrogen $\quad$

Consider the following portion of the energy-level diagram for hydrogen:
n = 4 $\quad$ -0.1361 $\times$ 10^-18 J
n = 3 $\quad$ -0.2420 $\times$ 10^-18 J
n = 2 $\quad$ -0.5445 $\times$ 10^-18 J
n = 1 $\quad$ -2.178 $\times$ 10^-18 J
-For which of the following transitions does the light emitted have the longest wavelength?

A) n = 4 to n = 3
B) n = 4 to n = 2
C) n = 4 to n = 1
D) n = 3 to n = 2
E) n = 2 to n = 1