The base of a pyramid is:

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Triangle

Rectangle

Parallelogram

Polygon

answer is D.

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Detailed Solution

Given a pyramid.
The base of any solid is that face of solid that touches the ground.
Polygon: A polygon is a two-dimensional figure that is made up by joining three or more sets of straight lines.
Triangle: A triangle is a polygon having three straight lines joined together vertex by vertex.
Rectangle: A rectangle is a polygon having four sets of straight lines that are joined to each other vertex by vertex.
Parallelogram: A parallelogram is a two-dimensional figure that has its opposite sides equal and parallel to each other.
A pyramid is a three-dimensional figure containing a polygon base such that all its side faces are triangular in shape. A pyramid can have its base as any polygon, there is only one condition to be fulfilled i.e., the side faces have to be triangular such that all the sides face meet at one point on the top.
Option (1) is incorrect because its value is a triangle which are the side faces of the pyramid not the base of the pyramid.
Option (2) is incorrect because its value is a rectangle which is also a polygon but its not necessary that it will be the base of the pyramid.
Option (3) is incorrect because its value is a parallelogram which is also a polygon but its not necessary that it will be the base of the pyramid.
The base of a pyramid is: any polygon.
Therefore, option (4) is correct.

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