The correct option is D CH3COOCH2CH3
∙ Esters are formed by the reaction between a carboxylic acid and an alcohol in the presence of a mineral acid catalyst.
∙ In the given reaction, ethanoic acid (CH3COOH) is reacting with ethanol (CH3CH2OH) in the presence sulphuric acid to give an ester, ethyl ethanoate (CH3COOCH2CH3). Hence, this is an esterification reaction.