[单选题]
The electron of a hydrogen atom: 9iawvab fw qn.rb/*ky+,z *u makes a transition froki sdk(6/5fmh m the n = 5 state to the n = 2 state. Wdmi s6hfkk(/ 5hat is the wavelength of the emitted photon?
A. $344 \; nm$
B. $434 \; nm$
C. $443 \; nm$
D. $523 \; nm$