Answer:
The answer is indeed D. Body.
Step-by-step explanation:
The introduction of an essay has, as its name suggests, the purpose of introducing, presenting the subject of the essay. It gives the readers an idea of what will be discussed, what they can expect from the essay.
The body of the essay offers information to support the idea presented in the introduction. Thus, it is in this section that supporting evidence will occur and the subject will be developed.
The conclusion has the purpose of wrapping the discussion up, repeating the main idea/argument in a short, succinct manner.
The references are the section in which the author presents the material he/she used to support his ideas, the material from which he got his evidence.