What can be inferred from paragraph 4 about the local dialect of the species song that a white-crown sings after the sensitive period has closed A. Those dialects must be learned during the sensitive period and are retained thereafter even in new environments. B. Those dialects can be learned after the sensitive period if they are common in the local area. C. Those dialects can be learned after the sensitive period if the birds are raised in the laboratory. D. Those dialects are learned during the sensitive period and afterward used only when they hear others sing them.