Which of the following reactions give a SECONDARY alcohol after (i) reaction with $\mathrm{CH}{}_3\mathrm{MgBr}$ (1 equiv, dry ether); (ii) $\mathrm{H}{}_3\mathrm{O}{}^{+}$?

Addition of a Grignard reagent to an aldehyde other than formaldehyde gives a secondary alcohol: acetaldehyde gives propan-2-ol and propanal gives butan-2-ol. Formaldehyde gives a primary alcohol (ethanol) and a ketone gives a tertiary alcohol (2-methylpropan-2-ol).