Which of the following give a tertiary alcohol when treated with excess $\mathrm{CH}{}_3\mathrm{MgBr}$ (dry ether) followed by $\mathrm{H}{}_3\mathrm{O}{}^{+}$?

Esters other than formates, and carbonates, give tertiary alcohols: ethyl propanoate gives 3-methylpentan-3-ol and diethyl carbonate gives 2-methylpropan-2-ol. Methyl formate gives propan-2-ol (secondary) and butanal gives pentan-2-ol (secondary).