According to what I remember, it would be B. El Nino.
Forgive me if this is wrong.
C) People become unemployed and cannot get services they need.
Factories provide jobs which keeps unemployment rates down. They make thosands of jobs worldwide so, when European countries removed these factories it made the unemployment rates skyrocket.
Some estimates put the first human settlements in the Amazon at 32,000 to 39,000 years ago. Since that time, Amazon people have developed lifestyles that are well integrated with the benefits and constraints of rainforests.
An estimated 7-10 million Amerindians (the term for American Indigenous peoples) lived in American rainforests, half of them in Brazil, at the time of European arrival. When Pizarro arrived in Peru, more land was under cultivation and more food was being produced in the Andean region than today.
I believe it's going to be (2,3)
More carbon dioxide is stored in the ocean water, making it more acidic, which is dangerous for most corals and many animals with small niches
