[单选题]
The binding energy of the hydrogen atom in its groua1. z8z g)qomp3gl/j.k 2r hi8 x/v79z,.z1brbx vl,gcii oq und state is -13.6 eV. What is the en9g r, oc/8bql,xbv.v zx zi1i7ergy when it is in the n = 5 state?
A. $2.72 \; eV$
B. $-2.72 \; eV$
C. $0.544 \; eV$
D. $-0.544 \; eV$