Geometry

Answer: C

Question Analysis
This question involves identifying which statement is not a biconditional.
The main focus is on recognizing the absence of "if and only if."

Key Concept Explanation:
A biconditional statement requires "if and only if" to link two statements.

Step-by-Step Solution:
Look for the phrase "if and only if" in each option.
Option C does not use "if and only if," making it a one-way conditional statement.

Option Analysis:
...