Concept:Esterification is the reaction between an alkanol and an alkanoic acid to form an alkanoate (ester).Explanation:An alkanol reacts with an alkanoic acid in the presence of concentrated sulphuric acid to produce an alkanoate and water.The general equation is:R−OH+R′COOH⇌R′COOR+H2OConcentrated H2SO4 acts as a catalyst and dehydrating agent.Heat is required to drive the reversible reaction forward.Water, NaOH, or aqueous HCl are not suitable for this esterification.Therefore, the necessary conditions are concentrated H2SO4 and heat.Answer:Option B: Conc. H2SO4 and heat.