Which sentence describes an example of the group behavior known as
swarming?
A. Honeybees gather around a new queen when their colony gets too
large for the existing hive.
B. Caribou run from predators in a large group, with weaker
individuals in the center.
C. Hyenas in a clan work together to encircle and bring down a zebra.
D. Thousands of small fish swim close together and watch for
predators.