Answer:
Online courses call for a greater amount motivation and self-discipline than a classroom-based course. A classroom has one or more instructors and peers, who can hold a student accountable for their course-work. In contrast, online courses involve setting our own goals, tracking progress and meeting deadlines.
I believe that the answer to the question provided above is may of the artworks in 1920 which uses cubism are usually in relation with the WW1.
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