Ithink its d correct me if i'm wrong
which challenge do volcanoes pose to east asia?

a.
they sometimes threaten densely populated areas.

b.
they reduce the arability of land for farming.

c.
they make island terrains ill suited for settlement.

d.
they produce a steady stream of air pollutants.

Did you already try any? Can I rule anything out?

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.