Amap with a scale of 1: 24,000 means that a. one unit on the map is equal to 24,000 units on the ground b. one unit on the ground is equal to 24,000 units on the map c. the contour interval is 24,000 feet d. the contour interval changes every 24,000 feet

Scales on a map designate the ratio between how far a measurement is on the map with how far it would actually be on the ground. In this case, answer A would be the most accurate: one (inch, centimeter, foot, etc.) would be equal to a ground-level distance of 24,000 (inches, centimeters, feet, etc.).