They are fresh water shelled protozoans

Foraminiferans and Radiolerians

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Arcella and Difflugia

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Vorticella and Kerona

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Both A and B

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Solution

The correct option is B Arcella and Difflugia
Protozoan organisms are usually single-celled and heterotrophic (using organic carbon as a source of energy), belonging to kingdom Protista. They live in a wide variety of moist habitats including freshwater, marine environments, and the soil.
Examples for freshwater shelled protozoans include Arcella and Difflugia.
They both produce shells(or tests) from mineral particles.
So, the correct answer is 'Arcella and Difflugia'.

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