The correct answer is C. Topic sentence
Step-by-step explanation:
In writing, a text aims at developing or explaining one main idea that in the case of essays or argumentative texts is the thesis statement. Additionally, this thesis is supported and explained through multiple paragraphs and each of these paragraphs contains a topic sentence, different supporting details, and a concluding sentence. In the case of the topic sentence, this is in most cases the first sentence of each paragraph that summarizes the content of the paragraph and also provides a specific idea or point of view that developed the main idea or thesis. This means in texts there are as many topic sentences as ideas and also this is the section in texts that makes clear what each paragraph is about and expresses a view about the subject matter that aims at developing the main idea or thesis of a text.