Which is the best example of commensalism?
A.Honey bees feed on the pollen of cornflowers and help the flowers reproduce.
B.barnacles ride on a gray whale’s back to obtain food, and the whale is not harmed.
C.Squirrels and chipmunks eat the same nuts in a forest where food is scarce.
D.Prairie dogs often collect and eat food in groups so they are better protected from enemies