Answer:
D. A funny, friendly piece that simply gives information and avoids taking sides.
Step-by-step explanation:
Option D is the piece of writing that is most appropriate for the task, purpose, and audience described in the prompt.
Actually, the task between the audience looks funny but yet friendly; it's just like a friendly argument. But yet the piece still gives information about grapes in United States. In fact, it informs the audience about the green and purple grapes available in United States. Also, the piece doesn't take sides. It actually reveals that the audience of elementary school students should take a firm stand on the issue.