Question

how do archaea obtain energy?

a most archaea are chemotrophs and derive their energy from breaking down molecules in their environment.

b a few species of archaea are photosynthetic and capture the energy of sunlight.

c both a and b

Explanation:

Most archaea are chemotrophs getting energy from molecule - breakdown, and a few are photosynthetic capturing sunlight energy.

Answer:

c. Both A and B