Which organisms are prokaryotes a. Archaea b. Fungi c. Protist d. Plants

The best answer is A.

Archaea are primitive micro organisms that have one cell and live in environments that are severe, such as those that are extremely salty or hot.

They are any of a group of single celled prokaryotic organisms that have distinct molecular characteristics separating them from bacteria and from eukaryotes.

An example of such is Pyrolobus fumarii which is found living in hydrothermal vents in temperatures of upto 235 degress Fahrenheit. They are also known to grow at pH 0. an extremely acidic environment.