Which sentence best summarizes the second paragraph of the Article?


A.In order to host a mega event, cities must spend billions of dollars to construct and manage many different venues.
B.Cities are required to construct new swimming pools and stadiums in order to host a big athletic event.
C.In order to host a mega event, cities must provide housing for athletes and transportation systems.
D.Cities are required to construct cycle-racing tracks called velodromes in order to host a big athletic event.