The correct option is C All of the above
Herkogamy - common strategy employed by hermaphroditic angiosperms to reduce sexual interference between male and female function. Herkogamy differs from other such strategies by supplying a spatial separation of the anthers and stigma.
Dichogamy - having pistils and stamens that mature at different times, thus promoting cross - pollination rather than self - pollination.
Self sterility - sterile to its own pollen or sperm.