An organism X reproduces in such great numbers that the water may appear red (red tides) and kills large marine animals like fishes. X belongs to group Y. Identify X, Y and the killed animals Z. (a) X – Gonyaulax; Y – Dinoflagellates; Z – Fishes (b) X – Paramecium; Y – Protozoa; Z – Fungi (c) X – Diatoms; Y – Chrysophytes; Z – Whales (d) X – Nostoc; Y – Cyanobacteria; Z – Crustaceans