The corpse flower produces the smell of rotting flesh to attract pollinators on the floor of the rainforest. This adaptation is an example of

Every insect pollinator is adapted to deliver the pollen from another of the male flower to the stigma of the female flower.  

Explanation:

This adaptation is very essential in the pollination of flowers. If new pollinators are used then the pollen will be delivered to the stigma of a different species which may lead to only cross pollination.

If this niche marketing of the flower to specific pollinators is not present then fruits of the same species will not form. Each plant species has a selective pollinators based on the floral scent.

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Well, defense and support to the ecosystem.

b is the answer and if you need further with anything message me