# Due to exinction of pollinator bee,a plant with obligate mutualism with this bee extinct.This can be placed in which cause of extinction?

$(a)\;\text{Alien species invasions}\\ (b)\;\text{Habital loss} \\(c)\;\text{***** exploitation} \\(d)\;\text{Co-extinction}$

If given a choice of the evil quartet,habitat loss is the factor which has led to loss of ware species than any other cause of extinction.
Hence (d) is the correct answer.