"The week's question"?? Your professor is making you post weekly? Please have your professor read this.

MartinBronke said:
what are the best was to sell your idea for your prototype or proof of concept.

First, you should proofread your post for typos before hitting “Post.” Second, you can NOT sell an “idea for a prototype.” You use the prototype to pitch the game concept ("idea," if you must).

See the answers your fellow students got to this question when they posted a couple days ago: https://gamedev.net/forums/topic/710408-tips-for-crafting-an-effective-sales-pitch​ and https://gamedev.net/forums/topic/710407-pitching-a-game-or-concept​​ - this topic is a Business And Law issue, not a Career Development issue. Accordingly, this post has been moved to the Business And Law forum. It's also locked because you and your classmates need to stop disrupting our forum with school assignment questions. You'll learn more by reading the stickies atop the Business And Law forum than you will by asking the question for the umpteenth time. Please do tell the professor, and have them read that article.