Which statements are wrong in the writing of a comparison and contrast essay?
选项：

A:It’s better for you to identify the subjects, indicate whether the essay will focus on similarities and/or differences, and express a viewpoint toward the subjects in a thesis statement.
B:The primary purpose of writing is to show how one thing is similar to or different from another, but not to make a point or reach a conclusion through comparison and contrast.
C:You should choose meaningful points for comparison and be sure to choose points for comparison that will support the purpose of writing and the thesis statement.
D:You should use transitional words or phrases to guide the reader.