[单选题]
The electron of a hydrogenz:ln shkm yzf( *wrh5+:4pgp0 atom makes a tran p r itc1lgf7cf10.m7usition from the n = 5 state to the n =pfi.c tc7r07l11mu gf 2 state. What is the wavelength of the emitted photon?
A. $344 \; nm$
B. $434 \; nm$
C. $443 \; nm$
D. $523 \; nm$