Answer: Option A.
The generation of nectar in flowering cactus is not a nonspecific defensive mechanism.
Step-by-step explanation:
Cactus is a xerophytes that have adaptations to survive in its environment.
Cactus have extrafloral nectaries that produce nectars for pollination.The generation of Cactus nectars is just to attract insects like bees for polloniation and not as nonspecific defensive mechanism.