Let us describe each answer
A. A polygon
It is a 2-dimensions figure, it is a closed figure as rectangle, triangle, square, hexagon, ...
B. A prism
It is a 3-dimensions figure, it has some faces (squares, rectangles, triangles) as cube, cuboid, pyramid, ...
C. Area
Is the number of unit squares that cover the surface of a closed figure
D. Circumference
Is the length of the circle
Since the figure is made up of flat surfaces and referred to as faces, then
It is a prism
The answer is B