What type of human population is represented by the age pyramid?

The correct option is B Declining population

An age pyramid is a graphic representation of proportion of various age groups of a population with pre-reproductive at the base, reproductive in the middle and post reproductive at the top. For human population the age pyramids show age distribution of males and females in a combined diagram. The shape of the age pyramids reflects the growth status of the population. In a declining population the shape of pyramid is urn shaped. And there is lower percentage of pre- reproductive population as you can see in the age pyramid.