Final answer:
W.E.B. Du Bois opposed Marcus Garvey's methods and believed Garvey's movement could potentially undermine the progress of African Americans. Du Bois's criticism aligns best with the statement that "Garvey's efforts undermine the progress of African Americans."
Step-by-step explanation:
W.E.B. Du Bois was a sharp critic of Marcus Garvey and his approaches towards the plight of African Americans during the 1920s. Du Bois disagreed with Garvey's "Back to Africa" movement and felt that Garvey's actions could potentially undermine the progress towards equality and civil rights that African Americans were striving for in the United States. A significant point of their difference was highlighted when Garvey solicited donations from the Ku Klux Klan to support his cause, which Du Bois and other Black leaders found profoundly objectionable. However, there is no direct quote among the options provided that matches the specific language Du Bois used to describe Garvey. Therefore, Du Bois's opposition can be best reflected in the statement "Garvey's efforts undermine the progress of African Americans." This captures the essence of Du Bois's criticism toward Garvey's separatist philosophy and actions that could potentially hinder the ongoing struggle for racial equality and integration.