Geometry

Question Analysis
This question involves determining the true biconditional statement based on a given condition.
The main focus is on ensuring that both the original statement and its converse are true.

Key Concept Explanation:
A biconditional statement requires both the original statement and its converse to be true, linked by "if and only if."

Step-by-Step Solution:
The given condition is: "If a quadrilateral is a rhombus, then it has four equal sides."
To form a biconditional, we need to include the converse: "If a quadrilateral has four equal sides, then it is a rhombus."
Option A correctly includes both the original statement and its converse.

Option Analysis:
A) Correct, as it includes both the original statement and its converse.