Answer:
The correct option is;
B. It is the ratio of the area of the circle to the area of the square from a cross section.
Explanation:
The formula for the volume of a pyramid = 1/3*Area of base*Height
The formula for the volume of a cone = 1/3*Area of base*Height
The area of the base of the square pyramid of side 2r = 2r*2r = 4r²
The area of the base of the cone of base radius r = πr²
The ratio of the volume of the cone to the volume of the square pyramid is given as follows;

Given that the height are equal, h/h = 1, which gives;

Therefore, where the π/4 comes from is that it is the ratio of the area of the circle to the area of the square from a cross section.