Geometry

Question Analysis:
This question tests the ability to identify a valid syllogism.
The main focus is on logical consistency and correct application of geometric properties.

Key Concept Explanation:
A valid syllogism follows a logical structure where the conclusion is necessarily true if the premises are true.

Step-by-Step Solution:
Option C is valid because:
Premise 1: All quadrilaterals have four sides.
Premise 2: All squares are quadrilaterals.
Conclusion: All squares have four sides (logically follows).

Option Analysis:
A) Invalid: Circles are not polygons.
B) Invalid: Not all polygons have three side...