For one mole of an ideal gas, the slope of $V$ vs. $T$ curve at a constant pressure of $2 \ atm$ is $X \ L \ mol^{-1} \ K^{-1}$. The value of the ideal universal gas constant '$R$' in terms of $X$ is
- A$X \ L \ atm \ mol^{-1} \ K^{-1}$
- B$\frac{X}{2} \ L \ atm \ mol^{-1} \ K^{-1}$
- C$2 \times X \ L \ atm \ mol^{-1} \ K^{-1}$
- D$2 \ X \ atm \ L \ mol^{-1} \ K^{-1}$
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