The correct choice is (a) Benzenamine
Easy explanation: Since it is an aromatic compound, the phenyl group C6H5 has to present with CH4N. Since it is a primary amine, the group NH2 can be separated leaving us with CH2. So, the formula of the compound is C6H5CH2NH2, which is benzylamine. Benzenamine has the formula C6H5NH2.