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If plants need oxygen for cellular respiration, then why do plants release oxygen into the atmosphere?

More oxygen is produced during photosynthesis than the plant needs for cellular respiration, so the plant needs to release the extra oxygen.
Plants need to collect more oxygen from the atmosphere because photosynthesis does not produce enough oxygen to meet their needs.
Plants need to release oxygen into the atmosphere so more carbon dioxide can enter the plant for photosynthesis.
Plants release oxygen into the atmosphere because the release of oxygen prevents the evaporation of water.

I'm a little confused on this, I was thinking A or C, but I could be totally wrong. Please help? thanks

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  1. Nevermind, it's A

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