Hi

The correct option is e) b,c,d.

EXPLANATION

Trypanosoma causes the disease sleeping sickness.

Entamoeba causes the disease Amoebiasis

Plasmodium causes the disease malaria.

Paramecium causes no disease

Thank you

Hii!
The answer will be option E. This is because , all the three plasmodium, trypanosoma and antamoeba are protozoans and are pathogenic.
Antamoeba causes, amoebiasis, trypanosoma causes sleeping sickness and plasmodium causes malaria.
So, all three are pathogens protozoans.
Hope this helps.
Good luck!