Unisexuality of flowers prevents
A: Geitonogamy, but not xenogamy
B: Both geitonogamy and xenogamy
C: Autogamy, but not geitonogamy
D: Autogamy and geitonogamy

it is often said c but geitonogamy  is also a type of self fertilisation and unisexual plant avoid self pollination

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See here autogamy is prevented because each flower only has either male or female organ but geitonogamy can not be prevented because a plant can have both male and female flowers so though geitonogamy is a kind of self pollination its functionally cross pollination without a pollinator you can't perform it.
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