The fixed action patterns to specific stimuli which activates nervous system making the muscular action without any involvement of brain in decision making are known as innate behaviours. Being genetically determined, these responses are nearly alike in all members of a population. This makes option A correct. Learning (learned behaviour) is modification of innate behaviour as a result of specific experiences and involves formation of memories by changes in neural connectivity. This makes option B incorrect. A form of learning that occurs during a brief genetically determined critical period shortly after birth is called as imprinting. Option D is incorrect. Conditioned is also a learned response in which stimulus becomes associated with a consequence. This makes option C incorrect. Correct answer is A.