Pls, help 100 points whoever answers gets brainiest! Which scenario describes a relationship of parasitism?

A . A tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat.

B. Oxpecker birds eat parasitic ticks off the backs of zebras.

C . Birds feed off the insects that are stirred up from the grasses as cattle move through.

D. A polar bear catches a seal for dinner.