Right answer is (a) Cat
For explanation I would say: Cat (Felis catus) (Species: Catus; Genus: Felis); Dog (Canis lupus familaris) (Species: Lupus; Genus: Canis); Cow (Bos taurus) (Species: Taurus; Genus: Bos); Lion (Panthera Leo) (Species: Leo; Genus: Panthera). Cat belongs to the family called Felicae which comprises of cat, lion, tiger and leopard.