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Choice B is the best answer. A person who is "dogmatic" believes strongly that their principles and opinions are true. Because Du Bois and Locke are implied to have one "unified vision" of Black American identity that they prioritize over the "diverse perspectives" of different writers, they can be described as dogmatic.

Choice A is incorrect. "Proficient" means "skilled." Du Bois and Locke are contrasted with Johnson, but nothing in the text suggests that Johnson was not skilled at making editorial decisions. Based on the text, the three editors just have different styles; they’re not necessarily more or less skilled. Choice C is incorrect. "Ambiguous" means "unclear" or "open to multiple interpretations." However, it’s actually Johnson who encouraged multiple interpretations ("diverse perspectives"). Since Du Bois and Locke are said to "diverge" from Johnson, we can assume that the views they published were not ambiguous, but instead clear and firm (a "unified vision"). Choice D is incorrect. "Unpretentious" means "not trying to impress others with greater skill or importance than is actually possessed." Du Bois and Locke are contrasted with Johnson, but nothing in the text suggests that Johnson is pretentious (trying to impress others).