To answer this question we need to analyze each available option
A. Swarming: this is a kind of strategy where there is a massive quantity of organisms, either for reproduction, defense, or migration, and is very common among insects. So this is the correct answer.
B. Hunting: This refers to the action of hunting and this is a behavior of all predators so this is incorrect.
C. Herding: This also refers to animals moving in a group, however, it is applied to farm animals.
D. Flocking: this refers to organisms that move together in large numbers and tend to be applied to large animals like wildebeest.