A student ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in the one of the heavier fractions could produce ATP in the light, while those in the lighter fraction could produce ATP in the dark. The heavier fractions are most likely to contain ___ aside from mitochondria.  A. Peroxisomes B. Starch granule C. Chloroplasts D. Plasmodesma

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