Question

I think 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.

Answer 1

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

Answer 2

D doses make sense so maybe