Those are all plateaus, though you could figure this out with elimination, too. Peninsulas are land forms with 3 sides water, mountains generally form in mountain ranges, and usually deserts are larger than the two small cells on the right side.
Advantage: #1 Almost 0 emissions (very low greenhouse gas emissions).
#2 They can be sited almost anywhere unlike oil which is mostly imported
Disadvantage #1 Nuclear plants are more expensive to build and maintain.
#2 Proliferation concerns - breeder reactors yield products that could potentially be stolen and turned into an atomic weapon
