Answer: B a tick attaches itself to the skin of a dog
Parasitism is a kind of symbiotic relationship, between two species, in which only one species attains the benefit and the other species is harmed or affected.
A tick attaches itself to the skin of a dog is an example of parasitic relation. In this relationship, the tick sucks the blood of the dog acts as a parasite, and the dog usually obtain disease due to the effect of ticks.