Answer:
Eubacteria
Step-by-step explanation:
Single called organism. Kingdom Prostista and Monera includes unicellular organisms. Hence Animalia is eliminated.
Single called organisms often found in human body is more directed to Kingdom Monera, as they are more in numbers inside our body
Archaebacteria are primitive bacteria that are found mostly in extreme places. Hence Eubacteria wins! Eubacteria is the correct option.