Which of the Following Is the Best Example of a Market

Which of the following is the best example of a market?

A) a group of high school students who are tired of cafeteria food and would like to eat lunch at an expensive restaurant located a few blocks from their campus
B) a physical facility large enough to accommodate all the people who want to buy or sell a good
C) senior citizens willing and able to cruise to the Bahamas
D) a geographic region targeted by a firm for new promotional efforts