Test analysis: this question examines the ability of understanding and analysis. The key to answering this question is to grasp the essence. From what we have learned, the nature of the May 4th Movement is a great and thorough anti-imperialist and anti-feudal patriotic movement, so A can embody the anti-imperialist and anti-feudal characteristics at the same time, while B, C and D can't embody the anti-feudal characteristics at the same time, so they are excluded. So choose a.