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self assembly

could anyone help with this multiple choice question? only one is correct

Molecules that self-assemble by a 1D non-nucleated self-assembly process only do so above a critical threshold concentration known as the critical aggregation concentration. Why do these molecules not self-assemble at all concentrations?

a.
Many body interactions are required to form an aggregate nucleus that is thermodynamically stable, which are highly improbable at such low concentrations
b.
The molecular partition function is at a maximum at very low solute concentrations.
c.
The entropy of mixing dominates the thermodynamics of the system at low solute concentrations, favouring the dispersal of molecules as monomers
d.
At very low concentrations the collision rate between molecules is not high enough to allow self-assembly to occur
e.
At very low concentrations there are not enough molecules in solution to form an aggregate

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