The correct option is B Predation
When A and B are related by predation, they are more likely to have similar population cycles, an increase in the prey population will cause a correponding increase in the predator population and vice-versa. Such a link is not seen in any other form of population interaction. In mutualism and commensalism, although the relationship favours an increase in the population size of the partner that benefits from the interaction, there will not be such similarity in their population cycles.