Geometry

Question Analysis:
This question evaluates understanding of sufficient conditions for square classification.
The main focus is identifying the most efficient proof method.

Key Concept Explanation:
A square is defined by:
Four equal sides (rhombus property)
Four right angles (rectangle property)
These two properties together are sufficient, as they imply all other square properties.

Step-by-Step Solution:
Recognize that squares combine rhombus and rectangle properties
Identify that both equal sides and right angles must be confirmed
Note additional properties (C, D) are redundant for proof

Option Analysis:
A. Insufficient - Could describe a rhombus
B. ...