The basic structure of an informative essay is very simple. It needs to have a beginning, middle, and end. These are known more formally as the introduction, body, and conclusion, respectively
C. and D. should be your answers. If not, its A. and B.
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The correct answer is C. The evidence textual offers the information to build the main idea. It also means that they are connected but they are different. The main idea has no sense without textual evidence. So, The main idea became the main idea because of the lack of textual evidence or the lack of pieces of information for that.
B.) change "have" to "has"
-1 is the sum of 3+(-4) because you have to subtract the negative from the positive and then you will get -1.