Answer: D. 0.69
Step-by-step explanation:
You can use SOHCAHTOA to find the right trigonometric identity to use:
Sine = opposite / hypotenuse
Cosine = adjacent / hypotenuse
Tangent = opposite / adjacent
The opposite side of angle A is side BC, which is 20 units long.
The hypotenuse is AB, which is 29 units long.
Opposite / hypotenuse = 20 / 29, which equals 0.689.
The correct choice is D.