Psychologist: Although studies of young children have revealed important facts about the influence of the environment on language acquisition, it is clear that one cannot attribute such acquisition solely to environmental influences: innate mechanisms also play a role. So, the most reasonable question that ought to be studied is whether__. Which one of the following most logically completes the passage? ["parents and peers are the most important influence on a child's learning of a language", 'language acquisition can ever be fully explained', "innate mechanisms play a more important role in language acquisition than a child's immediate environment", 'innate mechanisms are a contributing factor in language learning']