B. The nationalists desired an end to foreign dependence.
Explanation:
The statements best summarize the cause of nationalist revolutions in Central and South America is "The nationalists desired an end to foreign dependence."
This is evident in the fact that following the Napoleon movement to take over Spain and some other European countries, led to many colonized countries in central and south America under Spanish rule see the weakness of their colonial masters. This reinforces their zeal to govern themselves, a form of nationalism approach, which led them to desire an end to foreign dependence.
Once the river floods it can destroy houses that are near it or even crops, however, when the nile river floods it also helps water the soil near the river that will aide in planting crops
