Final answer:
Topic sentences and thesis statements are both arguable statements backed up by facts, with the thesis presenting the essay's main argument and topic sentences introducing supporting points in each paragraph.
Step-by-step explanation:
Topic sentences and thesis statements share a fundamental similarity in that they both serve as the backbone for the written work they are part of. The correct answer to what they have in common is D. they're both arguable statements backed up by facts. Both a thesis statement and a topic sentence present a main idea or argument that is then supported by evidence and analysis throughout a text. While a thesis statement presents the main argument or position of an entire essay or research paper, topic sentences introduce and focus on the individual arguments or points that support the thesis within each paragraph.
Planning the Main Points and Body Paragraphs
Your main points should be your topic sentences, expressed as one sentence at the beginning of each paragraph.
Preview these main points by adding because to your thesis statement.
Supporting the Thesis
Each paragraph works to support the thesis statement, ensuring that both the topic sentences and the thesis receive equal attention.
Topic sentences are the major supporting statements for your thesis, each one should support it.
In summary, both topic sentences and thesis statements are intended to be debatable and supported by factual evidence, establishing the structure and focus of the text.