Line and angle proofs

\overset{?}{T V}

is parallel to

\overset{?}{W X}

Cody constructed:

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

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.

High school geometry