Non-mobile protozoa are those protozoa that do not possess the ability to move or show any kind of locomotion. Among the options given, the correct answer is option 'A' - Sporozoans.

Sporozoans:
- Sporozoans are a group of parasitic protozoa that belong to the phylum Apicomplexa.
- They are characterized by their absence of locomotory organelles like flagella, cilia, or pseudopodia.
- Instead of active movement, sporozoans rely on the host's body fluids or other means for transportation.
- They have complex life cycles involving both sexual and asexual reproduction stages, with alternating forms in the host and vector.
- Examples of sporozoans include Plasmodium, which causes malaria, and Toxoplasma gondii, which causes toxoplasmosis.

Other Options:
b) Chrysophytes:
- Chrysophytes are a group of algae that belong to the phylum Chrysophyta.
- They are mostly unicellular and possess two flagella for locomotion.
- Chrysophytes are commonly found in freshwater environments and can be both free-living or symbiotic.
- Examples of chrysophytes include diatoms and golden algae.

c) Euglenoids:
- Euglenoids are a group of unicellular protists that belong to the phylum Euglenophyta.
- They possess a flagellum that allows them to move in water.
- Euglenoids also have a unique organelle called an eyespot, which helps them detect light for photosynthesis.
- Examples of euglenoids include Euglena and Phacus.

d) Amoeboids:
- Amoeboids are a group of protozoa that belong to the phylum Amoebozoa.
- They are characterized by their ability to form temporary extensions of their cytoplasm called pseudopodia for movement.
- Amoeboids can be found in various environments, including freshwater, soil, and marine habitats.
- Examples of amoeboids include Amoeba proteus and Entamoeba histolytica.

In summary, among the given options, sporozoans are the non-mobile protozoa as they lack locomotory organelles and rely on other means for transportation. Chrysophytes, euglenoids, and amoeboids are all mobile protozoa that possess different mechanisms for movement.