Line and angle proofs

\overset{\leftrightarrow}{T V}

is parallel to

\overset{\leftrightarrow}{W X}

Cody constructed:

$\overset{―}{W U}$ ‍ perpendicular to $\overset{\leftrightarrow}{T V}$ ‍ such that $U$ ‍ is on $\overset{\leftrightarrow}{T V}$ ‍
$\overset{―}{V Y}$ ‍ perpendicular to $\overset{\leftrightarrow}{W X}$ ‍ such that $Y$ ‍ is on $\overset{\leftrightarrow}{W X}$ ‍

Cody noticed that

△ U W V ≅ △ Y V W

using the Hypotenuse-Leg congruency postulate.

What theorem can Cody prove using these congruent triangles?

(Choice A)
When a transversal crosses parallel lines, alternate interior angles are congruent.
(Choice B)
When a transversal crosses parallel lines, same-side interior angles are congruent.
(Choice C)
Angles that form a linear pair are supplementary.
(Choice D)
Vertical angles are congruent.

Congruence, Similarity, Right Triangles, & Trig 241+