The correct options are
A it can lead to speciation
B it can lead to extinction
C it can lead to evolution
D it can lead to adaptation
Mutation is necessary because it is the primal force which drives animals towards adaptation, speciation and hence, evolution. But it can be considered an evil because not all mutations give favourable advantage to the organism. In fact, more mutations are harmful than are beneficial and therefore, mutations more often lead to the extinction of an organism or species, than it would lead to their evolution. Hence it is an evil, yet a necessary one.