Donnan effect is shown by

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(C) The $Donnan$ effect (or $Gibbs-Donnan$ effect) refers to the behavior of charged particles near a semi-permeable membrane that fails to distribute

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Both $(a)$ and $(b)$

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(C) The $Donnan$ effect (or $Gibbs-Donnan$ effect) refers to the behavior of charged particles near a semi-permeable membrane that fails to distribute evenly across the two sides of the membrane due to the presence of charged substances (like proteins) that are unable to pass through the membrane.In the human body,both blood and lymph contain plasma proteins which are large,negatively charged molecules that cannot cross the capillary endothelium. This creates an unequal distribution of diffusible ions across the membrane,which is the basis of the $Donnan$ effect. Therefore,both blood and lymph exhibit this phenomenon.

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