Jena is designing a frame for a client. She wants to prove to her client that m∠AGE ≅ m∠FHD in her sketch. What is the missing justification in the proof? Segment AB is parallel to segment CD, and transversal EF intersects segment AB at G and segment CD at H.

Statement Justification
segment AB is parallel to segment CD with transversal segment EF Given
m∠AGE ≅ m∠HGB Vertical Angles Theorem
m∠HGB ≅ m∠FHD
∠AGE ≅ ∠FHD Transitive Property

A. Alternate Exterior Angles Theorem
B. Corresponding Angles Theorem
C. Reflexive Property
D. Substitution Property