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Insulin is dissolved in a suitable solvent and the osmotic pressure \( (\pi) \) of solutions of various concentrations \( \left(\mathrm{g} / \mathrm{cm}^{3}\right) \mathrm{C} \) is measured at \( 20^{\circ} \mathrm{C} \). The slope of a plot of \( \pi \) against \( \mathrm{C} \) is found to be \( 4.65 \times 10^{-3} \). The molecular weight of the insulin \( (\mathrm{g} / \mathrm{mol}) \) is:
(a) \( 3 \times 10^{5} \)
(b) \( 9 \times 10^{5} \)
(c) \( 4.5 \times 10^{5} \)
(d) \( 5.16 \times 10^{6} \)
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