[单选题]
The binding energy of the hydrogen atom in its groundm7usk mvpcudm* wg1d/ 2 (3q9z st6f iw73 va,/4jbjrgkoate is -13.6 eV. What is the energy whenvjgf7, 4wo bar/3ij6k it is in the n = 5 state?
A. $2.72 \; eV$
B. $-2.72 \; eV$
C. $0.544 \; eV$
D. $-0.544 \; eV$