Give the relation between half-life $(t_{1/2})$ and initial concentration of reactant $([R]_0)$ for an $(n-1)^{th}$ order reaction.
- A$t_{1/2} \propto [R]_0$
- B$t_{1/2} \propto [R]_0^{2-n}$
- C$t_{1/2} \propto [R]_0^{n+1}$
- D$t_{1/2} \propto [R]_0^{n-2}$
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