The national fire safety code states that a ladder used by a firefighter must be placed so that the distance from the foot of the ladder to the wall is one quarter of the length of the ladder. What angle must a 12-m ladder make with the ground

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.

all of the measures need to be converted to the same measure; such as inches. if you do that it is easy to determine which is the longest, 2500 mm which is approximately 97.5 inches.