Ageologist asks you to look at some ocean sediment, knowing this "dirt" contains the remains of dead protists whose hard shells have fossilized. you mix the sediment with water and examine it under the microscope. the "shells" or "tests" you observe will most likely belong to which group(s)?

Radiolarium, foraminiferans, and diatoms

Explanation:

Diatoms:

It is a unicellular pirated algae that is solicited to form a cell that consists of two walls. Both the walls are overlapped. Cells are circular or elliptical.  

Radiolarians:

Theses are like animals and like the diatoms produce siliceous skeletons. Their cells are better preserved than diatoms cells. These are in the cone and rode shapes.  

Foraminifera:

This is most important in fossils than both abov4. It is also animal-like and produces calcium carbonate. It is a unicellular organism.

answer; (73%);

the answer your looking for is c. : )