To find the angle of elevation of the ramp, we can use the trigonometric function of tangent (tan). The tangent of an angle is equal to the ratio of the opposite side to the adjacent side of a right triangle. In this case, the rise of 2 feet is the opposite side, and the length of the ramp, 7 feet, is the adjacent side.
The angle of elevation, θ, can be found using the formula: θ = arctan(opposite/adjacent).
Substituting the values, we have: θ = arctan(2/7).
Using a calculator, we can evaluate this expression and find the angle of elevation:
θ ≈ 16.6 degrees.
Therefore, the correct answer is c) 16.6 degrees.
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