Answer:
The angle of elevation of the sun when casting the flagpole's shortest shadow is
.
Option (D) is correct .
Explanation:
As given
The world's tallest unsupported flagpole is a 282ft tall steel pole in Surrey, British Columbia.
The shortest shadow cast by the pole during the year is 137ft long.
Now by using the trignometric identity .

As the figure is given below
Perpendicular = AB = 282 ft
Base = BC = 147 ft
Putting all the values in the trignometric identity .




Therefore the angle of elevation of the sun when casting the flagpole's shortest shadow is
.
Option (D) is correct .