Which of the following scenarios involves the introduction of a potentially invasive species?

I. A species of tropical ant enters the United States from South America in a shipment of coffee.
II. European fish are released into an African lake for the purpose of sport fishing.
III. Wolves from Canada are released in a U.S. national park after an absence of several decades.
(also I know that the answer is either I and II or I and III, just don't know which one..)