The most economic activities were agriculture.
This means "what benefits does the volcanic activity have for the population?" I would say that the main benefit of continental volcanic activity is the expulsion of ash which can enrich the soil and in the tropics make it good for growing coffee, for example, as it does in El Salvador.
The answer is A only because immigrants have increased and so has boarder security.
The assignment is basically asking you to write about your experience with those emotions. Like for boredom express a time you were bored.
