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.
That is true, If you speak kindly and follow up with kind words, then you will sound more caring if you said it in a rude way.
Hope this helps! Have a great day. :)
-wfz
