Correct Answer - c
Self-incompatibility refers to the inability of pollen from a flower to germinate on the stigma of the same flower (or other flower of same plant). Depending on the origin of factors determining the mating types two categories of self-incompatibility have been recongnised:
(i) Gametophytic self-incompatibility (GSI). The incompatibility process is determined by the genotype of male gametophyte (pollen) itself, e.g., Liliaceas, Poaceae, Solanaceae.
(ii) Sporophytic self-incompatibilty (S SI). The incompatibilty process is controlled by the genotype of the sporophytic tissue of the plant from which the pollen is derived, e.g., Asteraceae, Brassicaceae.