Respuesta :
I wanna say the answer is D (they are multicellular)
Archaebacteria is considered the most rigid bacteria due to the presence of the cell wall which allows them to survive in any condition.
These are types of archaebacteria:-
- Halophiles
- Methanogens
- Acidophiles
The characteristic of the archaebacteria is the hard cell wall and unicellular. They are anaerobic organisms which means they can survive without oxygen.
Hence, Option C is the right option.
For more information, refer to the link:-
https://brainly.com/question/21461076