Which of these characteristics would most likely discourage self-pollination in a flower with both stamens and pistils?

Name: Which of these characteristics would most likely discourage self-pollination in a flower with both stamens and pistils?
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Question

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Long pistils and short stamens would make it difficult for the pollen from the stamens to reach the stigma (part of the pistil where the pollen needs to land for fertilization to occur), making it less likely for self-pollination to occur.

Which of These Characteristics Would Most Likely Discourage Self-Pollination in a Flower