Unisexuality of flowers prevents:

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(D) Unisexuality is an outbreeding device in flowering plants.
If a plant is dioecious (e.g.,papaya),it prevents both autogamy (self-pollination with

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(D) Unisexuality is an outbreeding device in flowering plants.
If a plant is dioecious (e.g.,papaya),it prevents both autogamy (self-pollination within the same flower) and geitonogamy (pollination between two flowers on the same plant).
Since the flowers are unisexual and located on different plants,the pollen cannot reach the stigma of the same flower or another flower on the same plant.
Therefore,it prevents both autogamy and geitonogamy.

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