Final answer:
A declining population is indicated by a population pyramid with a narrow base and a wider top. This shows that there are fewer children compared to older generations, suggesting lower birth rates and an aging population.
Step-by-step explanation:
A population pyramid is a graphical illustration that shows the distribution of various age groups in a population, which typically forms the shape of a pyramid when the population is growing. To determine if a population is declining, we look for a population pyramid that has a narrow base and a wider top. This indicates that there are fewer young people (children and young adults) compared to the older generations. In such scenarios, we can expect that the population will decline over time unless there is an increase in birth rates or a significant influx of younger migrants.
Answer B) The pyramid will have a narrow base and wide top correctly describes the population pyramid of a declining population. Such a shape suggests that the population has lower birth rates and an aging population, with fewer young people to replace the older generations as they pass away. This is often seen in post-industrialized countries that have transitioned to an urbanized society with smaller family sizes.