Relationship exhibited by a cuckoo laying its eggs in crow's nest is :-

$\begin{array}{1 1}(a)\;\text{Commensalism}\\(b)\;\text{Ammensalism}\\(c)\;\text{Brood parasitism}\\(d)\;\text{Predation}\end{array}$

Relationship exhibited by a cuckoo laying its eggs in crow's nest is brood parasitism
Hence (c) is the correct answer.