Final answer:
A developing country is likely to have a lower crude death rate than the US primarily because it has a smaller percentage of elderly people since economically undeveloped countries have more young individuals and fewer elderly individuals.
Step-by-step explanation:
We can hypothesize with some confidence that a developing country has a lower crude death rate than the United States because it likely has a lower percentage of elderly people. The reasoning behind this hypothesis is that age structures of economically undeveloped countries show greater proportions of children and fewer proportions of elderly people. In these countries, high birth rates often coincide with high infant mortality rates and relatively lower life expectancy, which means that a smaller percentage of the population reaches old age compared to more developed countries. Developed countries, conversely, tend to have lower birth rates and higher percentages of elderly individuals, contributing to a higher crude death rate overall.