Answer:
A. A lead sentence related to the thesis and several factual sentences supporting the thesis backed by referenced source information.
Step-by-step explanation:
An Expository essay several stages in one particular paragraph beginning with the explanation, illustration, clarification, and explication of the thought to convey the meaning emphatically and serve the purpose of choosing the expository genre. This kind of essay includes the investigation, evaluation and expounding to ensure the clarity and succinctness of the essay. Thus, in order to fulfill these requirements, each body paragraph begin with a lead sentence that reflects the key argument of the paragraph and followed by the factual evidence to support the argument and to add icing to the cake, the evidence should be backed by credible references and sources to prevent any confusion or disappointment among the readers.