The side view of the given cube is

A. Square
B. Triangle
C. Circle
D. Parallelogram

Hint: In this question, we are given a cube and we need to tell the shape of the side view of a cube. For this, we will first understand the dimension of the cube and then use our imagination to draw a side view of the cube. That side view will help us in identifying the shape.

Complete step-by-step solution:
Here we are given a cube as,

We know that a cube is a three-dimensional object bounded by six square faces. A cube has 6 square faces, 8 vertices, and 12 edges. Every edge of the cube is of equal length.
Dice, Rubik's cube, sugar cubes, and ice cubes are some of the examples of the cube.
Now, let us use our imagination and draw a side view of a cube. We see that side face looks like this:

Since all edges of a cube are equal, we can see that the side view of a cube looks like a square.
Hence option A is the correct answer.

Note: Students should note that the side view, front view, and top view of any cube will always look square because all the faces of the cube are the same. Students can use any object from the surrounding which is in the shape of a cube to draw the side view correctly. Students should note that there is a slight difference between the cube and cuboid. Cuboid only has opposite edges of the same length and the side view of the cuboid is a rectangle.