Q. Geitonogamy involves :
(a) Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population.
(b) Fertilization of a flower by the pollen from another flower of the same plant.
(c) Fertilization of a flower by the pollen from another same flower.
(d) Fertilization of a flower by the pollen from a flower of another plant in the same population.