[单选题]
The electron of a hydf13dm a )4c(bxrrzvz(hy 3af( rogen atom makes a transition from the n j 5es6f w,k.aa= 5 state to the n = 2 state. Whasfw je6a k.,5at is the wavelength of the emitted photon?
A. $344 \; nm$
B. $434 \; nm$
C. $443 \; nm$
D. $523 \; nm$