Final answer:
Alternate interior angles are angles that lie on opposite sides of the transversal and inside the two lines. When a transversal cuts two parallel lines, the alternate interior angles are equal. In other words, ∠stv is equal to ∠ruv. This is a key property of parallel lines and transversals.
Step-by-step explanation:
The question pertains to the properties of angles formed when a transversal cuts through two parallel lines. Specifically, it is asking about the relationship between the alternate interior angles ∠stv and ∠ruv. According to geometrical principles, when a transversal intersects two parallel lines, any pair of alternate interior angles are equal. Therefore, the correct answer is B: equal.