Explanation:

- The World Anti-Doping Agency (WADA) is headquartered in Montreal, Canada.

- Montreal is known for its strong international presence and diverse community, making it a strategic location for an organization of global importance like WADA.

- New York:

- New York is a major global city, home to many international organizations, but it is not WADA's headquarters.

- Athens:

- Athens has a rich history, especially related to sports and the Olympics, yet it is not the base for WADA.

- Paris:

- Paris is an influential European city, but it does not serve as the headquarters for WADA.