[单选题]
The electron of a hydrogen atom makes a transition from the n = 5 state g7jj .bx urotms4j tc/f;0 )g6yujj (f 0jx bm0ng-b) 8mi(z6mto the n = 2 s86jfzu) jx m-yjm(0m(bbgn0itate. What is the wavelength of the emitted photon?
A. $344 \; nm$
B. $434 \; nm$
C. $443 \; nm$
D. $523 \; nm$