Chad is building a slide for a new park. He wants the height of the slide to be 8 feet, and he wants the horizontal distance along the ground to measure 14 feet. After building the slide, Chad decides the slide needs a vertical safety support and wants to use a 4-foot piece of wood to build the support. How far from the point where the base of the slide meets the ground should Chad place the vertical support?

A.
4 feet
B.
1.8 feet
C.
28 feet
D.
7 feet