When you draw the diagram, you can form a right triangle.
The hypotenuse is the string where the kite is attached. The long leg is the distance of the stake to where the kite is directly above the ground. The short length is the distance of the kite from the ground.
We shall use sine to find the length of the string to the nearest foot.
sinΘ = opposite / hypotenuse
sin(40°) = 70ft / x
x = 70ft / sin(40°)
x = 108.90 ft
D.) 109 ft.
