The answer is b. Kathmandu.
The lower mantle is composed of magnesium, iron-bearing silicates, olvine, and pyroxene.
A non civic issue is an issue that is not able to be solved publicly by a city or state
Try C or B. Let me know how it goes!
The only disadvantage I could think of would be price of equipment needed to produce energy from the source (i.e. price of solar panels)
