Volcanoes in southeast asia have made the landscape very which led the people to rely on their rivers for many important uses.
a. dry
c. mountainous
b. dangerous
d. none of the above

Volcanoes in Southeast Asia have made the landscape very A. dry, which led the people to rely on their rivers for many important uses. 
When volcanoes erupt, they destroy the land, after which it takes a lot of time for it to recover and becomes as fertile as it used to be. Volcanoes also dry the land up, which is why the people in such areas have to find other means of survival.