Cnidocytes are found in
phylum porifera
phylum nemertea
phylum nematoda
phylum cnidaria

phylum Cnidaria

Explanation:

Cnidocytes represent a group of living organisms, whose members are Jellyfish, Sea Anemone, Hydra, Portuguese Caravel. Cnidocytes are found in the Cnidaria phylum.

Cnidaria, known in the past as coelenterates, are relatively simple animals with no circulatory and respiratory system, all of which are done through the diffusion process. They have diffuse nervous system and metabolism products are eliminated by mouth. The locomotion occurs through jets of water in the jellyfish and some polyps move slowly dragging or somersaulting.

the answer is c. it will give up it's valence electron to the other atom.