_____ has the expanding population pyramid.

Bangladesh

The correct answer is Option (1) → Bangladesh

Expanding Populations: The age-sex pyramid of Nigeria  is a triangular shaped pyramid with a wide base and is typical of less developed countries. These have larger populations in lower age groups due to high birth rates. The pyramids for Bangladesh and Mexico would look the same.

Constant Population: Australia’s age-sex pyramid is bell shaped and tapered towards the top. This shows birth and death rates are almost equal leading to a near constant population. The pyramid for Canada will also look the same.

Declining Populations: The Japan pyramid has a narrow base and a tapered top showing low birth and death rates. The population growth in developed countries is usually zero or negative.