In the right triangle, there is a relation between the 2 legs of the right angle and the hypotenuse (the opposite side to the right angle)
From the given figure
∵ leg1 = 7 ft
∵ leg2 = h ft
∵ hypotenuse = 16 ft
→ Substitute them in the rule above to find h
∵ 16^2 = 256 and 7^2 = 49
→ Subtract 49 from both sides
→ Take square root for both sides to find h
→ Round it to the nearest tenth
∴ h = 14.4 feet
The answer is B