The correct option is A pollination
∙ The process by which pollen grains get transferred from stamen to pistil is called "pollination".
∙ Pollen is the dust-like particles that are produced by the stamen which is the male part of the flower.
∙ As the insect move from one flower to another in search of nectar, these pollen grains stick to the insect's body and are carried to the pistil which is the female part of the flower.