The percentage of water that lies between cells can vary depending on the type of tissue and organism being discussed. However, in general, it is often estimated that the extracellular fluid (which includes interstitial fluid between cells) constitutes about 15-20% of total body water in humans.
If we are to choose from the options provided (5%, 10%, 15%, 20%), either 15% or 20% would be reasonable estimates for the amount of water that lies between cells, with 15% being a more conservative estimate in many contexts. Thus, I would suggest 15% as a likely answer, but 20% could also be applicable depending on the specific context.
So the possible answers could be c (15) or d (20) depending on what you are specifically referring to.
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