answer please.

as we know that , osmotic pressure = i CRT
here , C = concentration ; which is same for all (0.1M)
R= gas constant
T= temp.
i = vant haff' factor
now since CRT is same for all , so osmotic pressure will depend on ' i '  ,
i.e.. the one having greatest value of ' i ' will have highest osmotic pressure .
hence the correct option is D )
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