At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $(C \text{ in } mol \ L^{-1})$ of a certain polymer solution is $291 \ R.$ The temperature at which osmotic pressure is measured is: $(R \text{ is the gas constant})$
- A$271^{\circ} C$
- B$18^{\circ} C$
- C$564 \ K$
- D$18 \ K$
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