What are $\underline{A}, \underline{B}, \underline{C}$ in the following reactions? (I) $\left(\mathrm{CH}_3 \mathrm{CO}_2\right)_2 \mathrm{Ca} \stackrel{\Delta}{\longrightarrow} \underline{A}$ (II) $\mathrm{CH}_3 \mathrm{CO}_2 \mathrm{H} \underset{\operatorname{Red~P}}{\stackrel{\mathrm{HI}}{\longrightarrow}}$ (III) $2 \mathrm{CH}_3 \mathrm{CO}_2 \mathrm{H} \stackrel{\mathrm{P}_4 \mathrm{O}_{10}}{\longrightarrow} \underline{\mathrm{C}}$ $\underline{A} \quad \underline{B} \quad \underline{C}$

• A

  $\mathrm{C}_2 \mathrm{H}_6 \quad \mathrm{CH}_3 \mathrm{COCH}_3 \quad\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O}$
• B

  $\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} \quad \mathrm{C}_2 \mathrm{H}_6 \quad \mathrm{CH}_3 \mathrm{COCH}_3$
• Correct answer
  C

  $\mathrm{CH}_3 \mathrm{COCH}_3 \quad \mathrm{C}_2 \mathrm{H}_6 \quad\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O}$
• D

  $\mathrm{CH}_3 \mathrm{COCH}_3 \quad\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} \quad \mathrm{C}_2 \mathrm{H}_6$

Hence, the correct answer is option: 'C'.