Geometry

Question Analysis:
This statement directly addresses a fundamental condition used to prove a parallelogram.
The main focus is recognizing a sufficient condition.

Key Concept Explanation:
A quadrilateral is a parallelogram if and only if its diagonals bisect each other.

Step-by-Step Solution:
Diagonals bisect each other means each diagonal cuts the other into two equal parts.
This is one of the five standard conditions that always prove a parallelogram.

Common Mistakes:
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