Answer: B. 142.1 ft
Explanation:
Given: A support cable connects the top of a bridge tower to the road.
Since, the bridge tower is standing vertical to the the road, therefore, the angle made by it is a right angle.
Therefore, the triangle made by cable(hypotenuse) and bridge tower (Perpendicular) on road (base) must be a right angled triangle.
Therefore, by Pythagoras theorem, we have

Hence, the height of the bridge tower = 142.1 ft.