The correct answer is A. anemophily.
Anemophily is a type of pollination that is carried out by the wind. It is the most common type of pollination in plants that have small, dry flowers and no petals. The pollen grains are light and easily carried by the wind. When the pollen grains land on the stigma of a receptive flower, they germinate and grow a pollen tube that delivers the sperm to the ovule.
B. Hydrophily is pollination that is carried out by water. It is a relatively rare type of pollination, but it is found in some aquatic plants. The pollen grains of these plants are often sticky and can be carried by water currents to other flowers.
C. Zoophily is pollination that is carried out by animals. It is the most common type of pollination in plants that have large, showy flowers. The flowers often produce nectar or pollen that attracts animals, such as insects, birds, and bats. The animals then carry the pollen from one flower to another as they feed.
D. Entomophily is a type of zoophily that is carried out by insects. It is the most common type of pollination in plants. The flowers of insect-pollinated plants often have bright colors and strong scents that attract insects. The insects then feed on the nectar or pollen of the flowers, and in the process, they transfer pollen from one flower to another.