Biological control method is based on which type of interaction?

$\begin{array}{1 1}(a)\;\text{Predation}\\(b)\;\text{Parasitism}\\(c)\;\text{Mutualism}\\(d)\;\text{Competition}\end{array}$

Biological control method is based on predation type of interaction
Hence (a) is the correct answer.
answered Apr 1, 2014
edited Apr 1, 2014