The correct option is A CH4
Soda Lime Process : Alkanes produced from carboxylic acid by decarboxylation containing one Carbon atom less than the carboxylic acid (reactant).
Decarboxylating Agent:NaOH(Caustic Soda), CaO(Quick lime)
CH3COOH+NaOH△−−→CaOCH4+Na2CO3