Which of the Following Compounds Is Both a Brønsted-Lowry Acid $\mathrm { CH } _ { 3 } \mathrm { OH }$

Which of the following compounds is both a Brønsted-Lowry acid and base? $\mathrm { CH } _ { 3 } \mathrm { OH }$        $\mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 }$        $\mathrm { H } _ { 2 } \mathrm { O }$        $\left( \mathrm { CH } _ { 3 } \right) _ { 3 }\mathrm {~N}$
      I                              II              III            IV

A) I, II
B) I, III
C) II, IV
D) I, IV