[单选题]
The binding energy of the hydrogen atom in its ground state ikwbs5t sy -+an;ylv5m* 8 dcj2s -13.60.q2efoo dno 4 eV. What is the energy when it is no.4e2oqo0 fd in the n = 5 state?
A. $2.72 \; eV$
B. $-2.72 \; eV$
C. $0.544 \; eV$
D. $-0.544 \; eV$