What is the next step in the given proof? Choose the most logical approach.
A.
Statement: ∠EGC ≅ ∠AGD
Reason: Substitution Property of Equality
B.
Statement: ∠CGB ≅ ∠AGD
Reason: Vertical Angles Theorem
C.
Statement: ∠EGA and ∠EGB are supplementary.
Reason: Linear Pair Theorem
D.
Statement: ∠AGD and ∠DGB are supplementary.
Reason: Linear Pair Theorem