Which genre would most likely be used to educate a large group of people?

The correct answer is D. Lectures.

Lectures are designed to convey information to a large audience in an organized format, making them an effective method for education. They usually involve a speaker presenting ideas or concepts, often supported by visual aids, to facilitate understanding in a classroom or seminar setting. Other genres like plays, poems, and novels may inform or entertain, but they are not primarily focused on educating a large group.