Which of the Following Formula(s)best Represent(s)Graham's Law?
I $c \propto \mathrm{P} \times \mathrm{S}$

Which of the following formula(s) best represent(s) Graham's law?
I. $c \propto \mathrm{P} \times \mathrm{S}$
II. ${ }^{r_{1}} / r_{2}=\sqrt{d_{1} / d_{2}}$
III. $\mathrm{D}=\mathrm{S} \div \sqrt{\mathrm{MW}}$
IV. $\mathrm{r}_{1} / \mathrm{r}_{2}=\sqrt{\mathrm{M}_{1} / \mathrm{M}_{2}}$

A) 1
B) 3
C) 2 and 4
D) 3 and 4

Correct Answer:

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