It can be inferred that the author considers those historians who describe early feminists in the United States as "solitary" to be A. insufficiently familiar with the international origins of nineteenth-century American feminist thought B. overly concerned with the regional diversity of feminist ideas in the period before 1848 C. not focused narrowly enough in their geographical scope D. insufficiently aware of the ideological consequences of the Seneca Falls conference E. insufficiently concerned with the social conditions out of which feminism developed