Here's why:
* Thesis statement: This is the main argument or point that the writer is trying to prove or discuss in their writing. It acts as a roadmap for the entire piece, guiding the reader through the supporting evidence and analysis.
* Topic: The topic is the general subject of the writing, but it doesn't necessarily reveal the writer's stance or argument.
* Main idea: While similar to the thesis statement, "main idea" can sometimes refer to a specific paragraph or section, whereas the thesis statement covers the entire piece.
* Claim: A claim is a statement that is presented as true, but it might not be the central idea of the entire writing.
Therefore, thesis statement is the most accurate and comprehensive term for the central idea of a writing.