The _____ of an angle is the ratio of the opposite leg length to the adjacent leg length.
A. sine
B. cosine
C. tangent

Use:
SOH - Sin(angle) = Opposite/Hypotenuse
CAH - Cos(angle) = Adjacent/Hypotenuse
TOA - Tan(angle) = Opposite/Adjacent
By remembering that you know that the answer is C for tangent.