The correct answer is B) the ways that el niño changes weather patterns around the world.
To show cause and effect is the likely purpose of these presentations: the ways that el niño changes weather patterns around the world.
Cause and effect show us the way things were before an event, an action or an incident, and then, the way they are as a consequence of those events. That is the case of the weather phenomenon called "El Niño" or "La Niña," both phenomenons drastically affect the weather patterns in the world. Some times, they make the weather dryer and some years colder or with more than average rain. These kinds of effects affect agriculture and the daily living of citizens.