The best interpretation of a population pyramid with large bars at the top is:
D. This pattern indicates an aging population, which could lead to a population stagnation or decline.
In a population pyramid, large bars at the top represent a higher proportion of older individuals. This suggests that the population may have a significant number of elderly people, which can result in stagnation or decline if there are not enough young people at the bottom (the younger age groups) to replace them.