Radiolaria (or radiozoa) are protozoa that produce mineral skeleton often made up of silica. They exist as zooplankton in ocean bodies. Zooplanktons are heterotropic planktons that live in open water bodies; they feed on bacteria and algae and are fed on by fish and insects.
The skeletal remains of Radiolaria make up a large part of the ocean floor and are referred to as siliceous ooze.
From the above explanation, we can deduce that the correct option is b
