24、 How does the author consider those American historians who made attempts to probe into American feminism? (A) They are less aware of the international origins and development of 19th century feminism. (B) They are insufficiently aware of the economic and social conditions in mid-19th century. (C) They are not concerned about the movement advocated in the Seneca Falls conference. (D) They are overtly focused on the contemporary feminist activities in Europe.