Answer:
C: Triangle
Explanation:
You want to identify the shape of the base of the given prism, thus identify the type of prism it is.
Base
A prism is a 3-dimensional figure with rectangular faces and a base that is a polygon of some sort. The bases of a prism are parallel and congruent.
Here, the only parallel polygons of the figure are ones that have a triangular shape.
The base of the figure is a triangle.
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Additional comment
A prism is named for the shape of its base. That makes this prism a triangular prism.
If the prism is oblique or twisted (or both), the lateral faces may be parallelograms instead of rectangles.
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