Question

what is this book mostly about?
a the first people who lived in the grand canyon
b the first group of people to travel down the colorado river
c what makes the grand canyon a special place

Explanation:

To determine the answer, we analyze each option:

• Option A focuses on the first people in the Grand Canyon, but the question is about the book's main topic.
• Option B is about the first group to travel the Colorado River, which is a specific event.
• Option C (assuming the full option is "what makes the Grand Canyon a special place") is a broader topic that would likely cover various aspects of the Grand Canyon, making it the most probable main topic of a book about the Grand Canyon.

Answer:

C. what makes the Grand Canyon a special place