Geometry

Question Analysis:
This question requires applying AAS to a two-column proof.
The main focus is on:
Identifying the non-included side (AB ≅ DE) relative to the given angles.

Key Concept Explanation:
AAS fits because:
∠A and ∠C are two angles.
AB is the non-included side (not between ∠A and ∠C).

Step-by-Step Solution:
List given parts:
∠A ≅ ∠D
∠C ≅ ∠F
AB ≅ DE (side opposite ∠C, not between ∠A and ∠C).
This matches AAS, not ASA (which would require AC ≅ DF).

Option Analysis:
Why not (A) ASA? ASA requires the side to be between the angles. Here, AB is not between ∠A and ∠C.
Why (B) AAS? The side is...