I'll leave this here:
https://legacy.etap.org/demo/biology_files/lesson6/instruction4tutor.html
Normally, it would take approximately 59 minutes to burn off a slice of peperoni pizza. Most of us walk roughly three miles per hour. So, to burn the calories found in just one slice of peperoni pizza, we have to walk about three miles. Therefore, to burn off 4 slices of peperoni pizza, we need to walk approximately 12 miles.
The answer is letter B has commercial uses such as Alcohol production and bread making.