Mutualism refers to a mutually beneficial relationship between two species where both receive benefit from the other.
Mutualism occurs between butterfly and flower. Adult butterflies feast on the nectar provided by flowers, drawing it in through a long straw-like proboscis. While they are drinking, the flower's pollen clings to their feet and legs, being transferred to other flowers as they feed from flower to flower. In cooler climates, the flowers provide the butterfly with a warm place to rest, a feature that is particularly noticed in solar-tracking flowers that turn their blooms toward the sun as it moves through the sky.
Option (a)