To accurately determine what is happening with the photosynthetic organism at hour 12, we need to consider that "hour 12" typically suggests a point in the middle of a circadian cycle, usually representing noon for many organisms.
Given that photosynthetic organisms, like plants, rely on light for photosynthesis primarily during the day, option (a) "It is performing the light dependent reactions" would be the most accurate description of what is happening at hour 12, assuming this hour represents a time when light is available.
Therefore, the best answer is: a. It is performing the light dependent reactions.
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