Archaebacteria has no peptidoglycans, therefore B is incorrect. As a consequence, E is also incorrect, because not all of the options are correct.
There is no evidence or knowledge of any parasitic form of Archaebacteria, therefore D is also incorrect.
Archaebacteria can be autotrophic, but cant photosynthesize. Therefore, C is incorrect as well.
Archaebacteria are known for living in extreme environments, like environments with high salinity, deep in the ocean, withou oxygen, among others. Therefore, the correct answer is A. Are found in anaerobic or harsh conditions.