The correct option is C Archaeocytes
Archaeocytes or amoebocytes are amoeboid cells found in sponges. They are totipotent and they are along with other specialized sponge cells including collenocytes and structural elements, called as spicules. They move about within the mesohyl with amoeba-like movements. Sex cells of the sponge in sexual reproduction are formed from these amoeboid cells and thereby helping in reproduction. Hence, option C is correct.