What Is the Energy Required to Remove the Electron from a Hydrogen

Multiple Choice

What is the energy required to remove the electron from a hydrogen atom in the $n = 11$ state?

A) $12.4 \mathrm { eV }$
B) $1.24 \mathrm { eV }$
C) $13.5 \mathrm { eV }$
D) $0.141 \mathrm { eV }$
E) $0.112 \mathrm { eV }$