Answer:
A. Are classified in the Domain Archaea
Step-by-step explanation:
Your clues for this is:
Extremely hot
do not have peptidoglycan in the cell walls
These are characteristics of the prokaryotes under the Domain Archaea. These characteristics also differentiate them from the prokaryotes of Domain Bacteria.
Prokaryotes under the Domain Archaea are known for being able to thrive in extreme environments, both hot and cold. They also do not have peptidoglycan in the cell walls, instead they only have S-layers or surface layers.