Why is Curitiba,Brazil an ecocity? 

A)  Cars are allowed downtown only during certain hours. 
B)  The city puts a focus on mass transit. 
C)  It is expensive to live there. 
D)  The city limits the number of people allowed to live there.

Curitiba, Brazil is considered an ecocity because the city has a strong focus on mass transit, with a well-designed bus rapid transit system, bike paths and pedestrian walkways. Cars are also allowed downtown only during certain hours, which helps reduce traffic congestion and pollution. While the cost of living may be higher compared to other cities in Brazil, this is not a defining factor in why Curitiba is considered an ecocity. Additionally, there is no limit on the number of people allowed to live there.