Which of the following distances is closest to the diameter of Earth in feet?

The diameter of Earth is approximately 7,917.5 miles. To convert this distance into feet, we can use the fact that there are 5,280 feet in a mile. Thus, the diameter in feet can be calculated by multiplying the number of miles by the number of feet per mile:

7,917.5 miles * 5,280 feet/mile = approximately 41.9 million feet.

When considering the choices, 41.8 million feet is the closest approximation to the calculated diameter. This makes it the most accurate choice among the options provided, as it closely matches the correct conversion of Earth's diameter into feet.