Question, Please HELP AND EXPLAIN if anyone knows the answer and the explanation. I don't get it how you solve it.

Hannah, who lives in Charleston, SC, is taking a road trip with her father all the way across the country to Los Angeles, CA. She wants to draw an accurate map of the United States to document the journey. If she is drawing the country on a standard piece of paper (81/2 inches by 11 inches) and the USA is -2,500 miles wide, what is the most appropriate unit selection for the legend of the map?

Options.
1 in. to 20 miles
1/2 in. to 125 miles
1/4 in. to 400 miles

Why did you choose that answer? Use at least 2 complete sentences. What is another option for units that would be appropriate for this situation? Use at least 2 complete sentences to defend your response.