Answer:
Both Marcy and Jake are correct in their reasoning.
Marcy's reasoning correctly identifies that if the sum of two angles is 180°, and they are equal in measure, then each angle must measure 90°, which is characteristic of right angles.
Jake's reasoning correctly uses the fact that congruent angles have equal measures, and he appropriately substitutes m(ZXYZ) with m(ZABC) in the equation. His algebraic manipulation also correctly leads to the conclusion that both angles measure 90°, which makes them right angles.
So, the correct answer is:
C. Both Marcy and Jake are correct.