Cattle egrets are a type of bird that live in many places throughout the world. They can often be found in pastures with livestock. As the livestock walk through low vegetation, they stir up insects which the egrets then are able to catch and eat easily. Which of the following relationships is most like the given example of the cattle egret and livestock?

A.
A pride of lions in sub-Saharan Africa hunt zebras as one of their main sources of food.
B.
Ticks feed on the blood of animals, often transmitting disease to the animal that was bitten.
C.
Flowers provide bees with nectar, a source of food, and the bees help the plants reproduce by transporting pollen to other flowers.
D.
Barnacles, without doing harm, attach to whales and are able to catch plankton because of the whale's movement through the water.