Final answer:
The United States is considered a developed country due to its high standard of living, advanced infrastructure, and strong economy.
Step-by-step explanation:
Out of the options given, the United States is considered a developed country. It has a high standard of living, advanced infrastructure, and a strong economy. For example, the United States has a high GDP per capita, which is a measure of economic productivity per person. It also has a well-established healthcare system, education system, and technological advancements.