Answer:
C. transferring pollen from the anther to the pistil
Explanation:
Pollination is the process of transferring pollen grain from anther of male to stigma or pistil of the flower.
Bees are good pollinators. Bees feed on nectar and collect pollen grains from another. Some of the pollen grains stick to the hair of the mouth, on visiting other plants, they rub this pollen grain on the stigma or tip of pistil (female reproductive organ) of the flower.