It can be inferred from the passage that, before Wagner, most students of Afro-American poetry did which of the following? A. Contributed appreciably to the transfer of political protest from Afro-American poetry to direct political action. B. Ignored at least some of the historical roots of Afro-American poetry. C. Analyzed fully the aspects of social protest to be found in such traditional forms of Afro-American poetry as the Black spiritual. D. Regarded as unimportant the development of fervent emotionalism in a portion of Afro-American poetry. E. Concentrated on the complex relations between the technical elements in Afro-American poetry and its political content.