Concept:A tertiary alkanol has the hydroxyl group (−OH) attached to a carbon atom that is bonded to three other carbon (alkyl) groups.Explanation:For the molecular formula C4H10O, the tertiary alcohol is 2-methylpropan-2-ol.Its central carbon atom is connected to three methyl groups and one hydroxyl group.Therefore, the structural formula is (CH3)3COH.This matches option C.Answer:(CH3)3COH — option C.