The correct option is A I-D, II-C, III-B, IV-A
The diatoms belong to the chrysophytes. Chrysophytes include the golden algae, commonly called ‘Jewels of Sea’.
Gonyaulax is a dinoflagellate and it causes the ‘red tide’ phenomenon.
Euglena, belonging to the euglenoids, is considered to be the connecting link between plants and animals as it has characteristics of both.
Paramoecium is a protozoan and is commonly called the ‘slipper animalcule’ because of its shape.