The standard of living in the US is more than most other countries because its economy is sufficient to meet the requirement of most of the basic needs.
Standard of living is a phenomenon that deals with the income, access to the resources, ability to fulfill the requirements and needs. The standard of living of the US citizens is higher than most others in the world.
The exponential economic growth in the last century has ensured that the basic needs stay fulfilled to most of the citizens in the United States.
Hence, option C holds true of the higher standard of living in the United States.
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