Which Is NOT a Parasitic Relationship

Which is NOT a parasitic relationship?

A) The Dutch elm disease fungus infects and kills elm trees.
B) The yellow fever virus causes fever and sometimes kills humans.
C) A female tick fastens to the skin of a human host and draws blood for nutrition to make her eggs.
D) The trichina worm burrows into muscle tissue,forms a cyst,and waits to continue its cycle until a predator consumes the host.
E) Unsightly dandelions sprout in a yard and compete with the fescue grass for sunlight.