Radiolarians have a cell wall made of

Radiolarians have a cell wall made of
According to
 https://microbewiki.kenyon.edu/index.php/Radiolaria
"
Radiolaria are unicellular organisms. They have mineral skeletons (tests) that are composed of silica. The tests are formed through the absorption of silicon compounds. This skeleton is covered with cytoplasm, which is withdrawn if the organism is disturbed."
There cell wall is made of according to another website
...
 "Radiolariahave cell walls made up of thick cellulose walls"
Hope this helps:)
@SamSamySamantha

The answer is c the potato slice shriveled because water moved out of the slice into the salt solution