In Which of the Following Ions Does Carbon Have a Formal

Multiple Choice

In which of the following ions does carbon have a formal charge? $\left[ \left( \mathrm { CH } _ { 3 } \right) _ { 4 } \mathrm {~N} \right] ^ { + }\quad$$\left[ \mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } \right] ^ { - }\quad$$\left[ \mathrm { CH } _ { 3 } \mathrm { OH } _ { 2 } \right] ^ { + }$
$\quad$ I $\quad\quad\quad\quad\quad\quad\quad\quad$ II $\quad\quad\quad\quad\quad$ III

A) I
B) II
C) III
D) None of the above