a) option is correct
Step-by-step explanation:
Circumstances under which asexual reproduction likely to be favored is when there are plenty of resources such as space and food
Sexual reproduction is favored when sea anemones are stressed due to lack of resources, predation, infection, or others
In this way it is beneficial to reproduce in a way that enables dispersal to a new site and/ or genetically diverse offspring, some of which will more likely survive selection than a clone identical to the animal would