Which of these is an example of mutualism? a -cattle egret eats the exposed insects as the cattle graze b -honeybee pollinates a flower while gathering nectar c -tick gains nourishment by sucking blood from a dog d -two bucks fight to gain territory and to gain a mate

The correct answer is B. Honeybee pollinates a flower while gathering nectar.

Mutualism is an interspecific interaction between two species in which both the species are benefited from the interaction. Honeybee visits flower to collect nectar for its food. In the process of collecting nectar, pollen grains stuck to its body. Flower gets pollinated when hone bee visits another flower. Thus, both  honeybee and plants get benefit from this interaction.    

its B cause it the both good for each other