Considering its purpose, select the best example of proper manuscript layout for an argumentative essay.

The selection highlighting the introduction with a defined thesis statement, body with evidential support, and discussion of competing theories aligns well with the structure typically recommended for an argumentative essay. This format effectively sets the foundation for presenting a clear argument, which is essential in argumentative writing.

Beginning with a defined thesis statement provides a specific claim or position that the essay will support, guiding the reader on the focus of the paper. Following this, the body of the essay is crucial as it presents evidence to substantiate the thesis, employing logical reasoning and factual support to persuade the audience. Discussing competing theories or counterarguments is also an essential component, as it demonstrates the writer's understanding of the subject matter and acknowledges differing perspectives. This enhances the credibility of the argument by showing that the writer has considered alternative views and reasoning.

While the other options include relevant components that could contribute to an argumentative essay, they do not reflect the most effective layout for this type of writing as clearly as the selected response does. For example, presenting an overview of the topic and concluding discussions, without a defined thesis and structured evidence, would not provide the same persuasive impact or organizational clarity as outlined in the correct choice.