To my mind the correct option is C. European, Asian, and African plants became a part of the American environment.
The Columbian exchange, also called the Columbian interchange, a name tha received for Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the Americas, West Africa, and the Old World in the 15th and 16th centuries.
The answer is B. The European Union was created 25 years ago a few decades after the European Economic Union. Before the United Kingdom left entirely in 2021 there were a total of 28 members.
The answer is #2. Pluto.
Pluto was the roman god version of Hades, who was the greek god of the underworld.
Hope that helps :)