Answer:
Option D, Organisms from different species looking for the same resource
Step-by-step explanation:
Here the cow and worm belongs to two different species. While a cow belongs to a B.Taurus, a worm belong to species Taenia. Though both these organisms belong to different species they depend on the same food which is ingested by the cow for its own nourishment.
This a kind of symbiotic relationship in which the cow is harmed while the worm is benefitted.
Thus, option D is the correct choice of answer