Among the compounds $A$ and $B$ with molecular formula $C_9H_{18}O_3$,$A$ has a higher boiling point than $B$. The possible structures of $A$ and $B$ are

• A
  $A$ = $1,3,5-$tris(hydroxymethyl)cyclohexane,$B$ = $1,3,5-$trimethoxycyclohexane
• B
  $A$ = $1,3,5-$trimethoxycyclohexane,$B$ = $3-$($3$,$5$-dihydroxycyclohexyl)propan$-1-$ol
• C
  $A$ = $1,3,5-$trimethoxycyclohexane,$B$ = $1,3,5-$tris(hydroxymethyl)cyclohexane
• D
  $A$ = $1,3,5-$tris(hydroxymethyl)cyclohexane,$B$ = $3-$($3$,$5$-dihydroxycyclohexyl)propan$-1-$ol