Step 1: Understanding the Concept
The question requires identifying a triangle from a set of geometric shapes. A triangle is a polygon with three sides and three angles. Step 2: Detailed Explanation
(A) is a Circle.
(B) is a Pentagon (5 sides).
(C) is a Triangle (3 sides).
(D) is a Square (4 sides).
Therefore, the shape in option (C) is the triangle.