Answer: b. asexually
Step-by-step explanation:
Protist Kingdom - Includes unicellular and eukaryotic organisms such as protozoa and certain algae. Protozoa (from Greek protos, 'first'; zoou, 'animal') are single-cell eukaryotes devoid of chlorophyll; live alone or forming colonies in the most varied types of environments; they may be aerobic or anaerobic and exhibit free life or associate with other organisms.
Protists reproduce mainly asexually. Cissiparity and twitching are very common. In some cases sporulation occurs, the type of reproduction in which a cell undergoes nuclear divisions followed; Each nucleus is then isolated with a part of the cytoplasm by constituting a new surrounding membrane. Thus, several smaller cells are formed, which in turn give rise to new individuals.