Among the following which condition causes self pollination?

A flower is self-pollinated (a “selfer”) if pollen is transferred to it from any flower of the same plant and cross-pollinated (an “outcrosser” or “outbreeder”) if the pollen comes from a flower on a different plant. Cleistogamy. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. Maturation of anthers and stigma of a flower at the same time is called homogamy.  Monoecy is a sexual system in seed plants where separate male and female cones or flowers are present on the same plant.