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Gezahegn T
The question likely implies that flocculated → dispersed decreases permeability, so the reverse (dispersed → flocculated) increases permeability. If the options are fixed, (d) is the closest to describing a structural change affecting permeability.

However, Option (b) (change to a less viscous fluid) also increases permeability, but it's a fluid property change, not soil structure.

Final Answer:(d) is the best choice among the given options for a soil structure-related permeability increase.