Fertilization of a flower by the pollen from a flower of another plant in the same population.
Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.
Fertilization of a flower by the pollen from another flower of the same plant.
Fertilization of a flower by the pollen from another same flower.
Geitonogamy is a fertilization of a flower by the pollen from another flower of the same plant. It is seen in monoecious plants like maize. It is a cross pollination within the same plant. In this, pollens are transferred by insects or winds. Thus, the correct answer is option C.