The correct answer is The first body paragraph.
The sentence would most likely be part of the first body paragraph.
The sentence is “During the Neolithic revolution, irrigation was introduced which produced larger crop yields, allowing people to store a surplus of food.” The statement has the characteristics of the first body paragraph. In any paper, the introduction should include a thesis statement for the reader to know the topic of the paper. Then, at the end of the introduction, the writer must write a “hook” that connects with the first paragraph of the document.