Which of the Following Has(have) a Higher Oxidation State of Carbon

Multiple Choice

Which of the following has(have) a higher oxidation state of carbon than the carbon in formaldehyde, $\mathrm{H}_{2} \mathrm{C}=\mathrm{O}$ ?
I. $\mathrm{CH}_{3} \mathrm{OH}$
II. $\mathrm{HCO}_{2} \mathrm{H}$
III. $\mathrm{H}_{2} \mathrm{CO}_{3}$

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