The formulas of A and B for the following reaction sequence are

$\displaystyle \mathrm{A}=\mathrm{C}_7 \mathrm{H}_{14} \mathrm{O}_8, \quad \mathrm{~B}=\mathrm{C}_6 \mathrm{H}_{14}$

$\displaystyle \mathrm{A}=\mathrm{C}_7 \mathrm{H}_{13} \mathrm{O}_7, \quad \mathrm{~B}=\mathrm{C}_7 \mathrm{H}_{14} \mathrm{O}$

$\displaystyle \mathrm{A}=\mathrm{C}_7 \mathrm{H}_{12} \mathrm{O}_8, \quad \mathrm{~B}=\mathrm{C}_6 \mathrm{H}_{14}$

$\displaystyle \mathrm{A}=\mathrm{C}_7 \mathrm{H}_{14} \mathrm{O}_8, \quad \mathrm{~B}=\mathrm{C}_6 \mathrm{H}_{14} \mathrm{O}_6$