In a right triangle, which of the following expressions represents $\sin \theta$ for an acute angle $\theta$?

• A. $\frac{\text{hypotenuse}}{\text{opposite}}$
• B. $\frac{\text{adjacent}}{\text{hypotenuse}}$
• C. $\frac{\text{opposite}}{\text{adjacent}}$
• D. $\frac{\text{opposite}}{\text{hypotenuse}}$

Answer: (D)