Anonnative speaker learning english would most likely struggle with which of these grammatical structures? subject/verb agreement

Make sure the topic of your persuasive essay is not a.something someone else is writing about b.a fact c.something you have written about before

Doug plans to end his adventure story by introducing a new character during the climax. the new character happens to be an experienced guide who will lead the protagonist down a treacherous mountain and into safety. explain the problem with his plan.

According to the essay how do meat eaters feel about vegans