[单选题]
The electron of a hydrogen atom maogyn 1vjb2 0b-kes a*z/ .grcfzpyl ; 5flz8 transition from the n = 5 state to the n = 2 state. What is the wavelength o * y;lzzr8lfpf/c.z5 gf the emitted photon?
A. $344 \; nm$
B. $434 \; nm$
C. $443 \; nm$
D. $523 \; nm$