The correct answers are A) natural-born citizens and B) naturalized citizens.
The groups of people living in the U.S. that have the right to own and operate a business are natural-born citizens and B) naturalized citizens.
You must comply with the aforementioned requisites to have the right to own and operate a business in the United States. To apply for citizenship, you must be 18 years old, have to be able to speak, read, and write basic English, and you must have lived in the country for 5 years in a row; or three years if you are married to a US citizen. The government authorities are going to examine your situation and if that is the case, you will have an interview with them.