The shadow would be the adjacent cathetus to the angle and the height is the opposite cathetus, then we need to use the tangent rule, we will get:
height = 57.98ft*tan(34.6°)
None of the given options represent the height.
How to get the height?
We know that the shadow has a length of 57.98ft, and the angle of elevation of the sun is 34.6°
If we step at this angle, the shadow is the adjacent cathetus and the height is the opposite cathetus.
Remember the tangent trigonometric relation:
Tan(angle) = (opposite cathetus)/(adjacent cathetus)
Then we would get:
tan(34.6°) = (height/57.98ft)
Solving for the height we get:
height = 57.98ft*tan(34.6°) = 39.998 ft
So none of the options is actually correct.