Americans represent what percentage of the world's population?

The correct choice indicating that Americans represent approximately 5% of the world's population is grounded in demographic data. As of recent estimates, the total population of the United States is around 330 million people, while the global population is over 7.9 billion. When you perform the calculation, 330 million is roughly 4.2% of 7.9 billion, which rounds to about 5%. This statistic is often referenced in discussions about global demographics, underlining how a relatively small number of individuals can have significant influence due to economic and political power.

The other options, while they might seem plausible, do not accurately reflect the demographic size of the U.S. population in relation to the global population. For instance, percentages like 10%, 15%, or 20% would imply a much larger proportion of the world's population residing in the United States than is actually the case. Therefore, the figure of 5% properly highlights the U.S.'s share in a larger global context.