the Gulf Stream the jet stream La Niña El Niño
I gave my students this multiple choice question: What is the cause of rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America?

Only one answer is correct among these 4 choices:
- the Gulf Stream
- the jet stream
- La Niña
- El Niño

Could you tell me which one is correct?

El Niño