Geometry

Question Analysis:
This is a property identification problem.
The main focus is on recognizing isosceles trapezoid conditions.

Key Concept Explanation:
In an isosceles trapezoid, legs and diagonals are congruent.

Step-by-Step Solution:
Only in isosceles trapezoids are diagonals guaranteed to be equal.

Option Analysis:
A. Not always true in trapezoids
B. Correct – Diagonal congruence is a key feature
C. Legs are no...