The correct option is C Autogamy
Autogamy is the self-fertilization, meaning the pollen is transferred from the anther to the stigma of the same flower.
Allogamy is cross-pollination where the pollen is transferred from the anther of one plant to stigma of flower of another plant.
Geitonogamy is functionally cross-pollination involving a pollinating agent, but the pollen is transferred from the anther of one flower to the stigma of the different flower but on the same plant.
Thus, the correct answer is option (C), 'Autogamy'.