The question asks for a contrast between the styles of two artists. Read all the points, because some may contain helpful background information, but only read the points that mention the artists' styles carefully. The first two points do not name any artists, so read them quickly. The third point mentions Douglas, so note that his style "connected traditional imagery from African masks and sculpture to cubism." The fourth point describes cubism as using "fractured and fragmented imaginary shapes." The fifth point describes Barthé's style as "a nuanced and realistic aesthetic." A good prediction would be something like "Douglas" style used unusual shapes, but Barthé's style was realistic." This prediction matches (D), the correct answer.
As a strategy tip, notice that (D) is also the only choice that uses a contrast keyword, "whereas," and mentions both artists. This is enough to identify the correct answer even if you found it challenging to describe the exact difference between the artists' styles.
None of the incorrect choices include the features the question demanded: (A) ignores Douglas, (B) presents a similarity, not a contrast; and (C) ignores Barthé.