Final answer:
The incomplete question seems to pertain to the properties of angles formed by parallel lines intersected by a transversal, such as congruency of vertical angles, alternate interior/exterior angles, and corresponding angles. Vertical angles are always congruent when two lines intersect.
the correct answer is Options C
Step-by-step explanation:
The question seems to be incomplete as it lacks clear variables or elements that would point to a specific mathematical theorem or property.
However, based on the given options for justification (alternate interior angles, alternate exterior angles, vertical angles, and corresponding angles), it can be inferred that the context is likely around the properties of parallel lines intersected by a transversal in geometry.
If we consider the given justifications, option C, vertical angles are congruent, is a general mathematical truth. When two lines intersect, the opposite (or vertical) angles are equal to each other. Options A, alternate interior angles, and B, alternate exterior angles, are congruent if the lines are parallel. Option D, corresponding angles, are also congruent when dealing with parallel lines.
Without additional context, it's challenging to definitively identify which justifies "Jackie's statement," but these principles are commonly applied in geometry and could justify many statements regarding angles formed by intersecting lines or parallel lines and a transversal.