Which of the following reacts with benzoic acid to form ethyl benzoate?

When benzoic acid reacts with ethyl alcohol in the presence of sulphuric acid ethyl benzoate is formed. This is known as esterification.

$\underset{\text{Benzoic acid}}{{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}}+\underset{\text{Ethyl alcohol}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\underset{\text{Ethyl benzoate}}{{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{COOC}}_2{\mathrm{H}}_5}+\underset{\text{water}}{{\mathrm{H}}_2\mathrm{O}}$