During the 2016 Summer Olympics in the City of Rio

During the 2016 Summer Olympics in the city of Rio, some Rio residents rented rooms to visitors. This behavior

A) helped reduce the shortage of hotel rooms caused by the high demand during the Olympics.
B) reduced the demand for tickets to the Olympics since many local residents left town while they rented out space in their homes.
C) helped raise the prices that visitors paid for hotel rooms in Rio.
D) raised the demand for hotel rooms in Rio and should have been prevented by the city of Rio.