Biology

The correct answer is: A.Commensalism.

In this case, the barnacles attach themselves to whales. The barnacles benefit by gaining access to the water’s flow, which helps them filter feed as the whale swims through the ocean. However, the whales are neither harmed nor benefited by the presence of the barnacles. The barnacles gain a place to live, but they do not affect the whale in any significant way.

Here’s why the other options don't apply:

B.Parasitism:

Parasitism involves one organ...