Correct option is B
in entomophily the pollination is done by insects, these are the most common biotic agents of pollination, bees are the most common insect which acts as a pollinating agent, other insect pollinators are butterflies, flies, wasps, beetles and ants. The tallest flower of Amorphophallus (the flower itself is about 6 feet in height). The pollen grains are sticky in animal pollinated flowers. Pollen grains in many water pollinated plants are long, ribbon like and they are carried passively inside the water; some of them reach the stigma and achieve pollination. Wind pollination also requires that the pollen grains are light and non-sticky so that they can be transported in wind currents.