The transport of a molecule is investigated using two chambers (left and right) separated by a synthetic membrane containing transport proteins. A solution containing varying concentrations of the molecule is added to the left side while pure water is added to the right. The transport rate of the molecule is determined by measuring the concentration of molecule that accumulates on the right side. The following table summarizes the transport rate of the molecule at various concentrations. Based on this you can conclude:  a) the molecule is most likely transported by facilitated diffusion     b) the molecule is moving across the membrane by passive transport     c) the membrane is freely permeable to the molecule     d) the molecule is most likely transported by active transport

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