Based on the information given, it should be noted the central idea is C. Making and using a solar oven is a learning experience.
<h3>What is a central idea?</h3>
A central idea simply means the main idea that's in a literary work. It's the unifying element that's in a story.
The central idea is that making and using a solar oven is a learning experience and the detail that supports the central idea is that "by completing this project, you will make an inexpensive, ecologically friendly piece of equipment and learn about the science behind what you’re doing".
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