Answer: letter C (L.atm/K.mol)
Step-by-step explanation:
The question requires us to choose among the options given which one corresponds to the units of the ideal gas constant with value 0.0821.
The ideal gas constant is a proportionality constant that relates the energy scale (in units of pressure) to the temperature scale and the scale used for the amount of a substance (usually, in moles). It is a combination of the constants from different Laws for gases (Boyle's Law, Charles' Law, Gay-Lussac's Law and Avogadro's Law).
The ideal gas constant (R) can be expressed in different combinations of units for pressure, volume, temperature and amount of matter. A common representation of R is given in L.atm/K.mol, which value corresponds to 0.082057.
Therefore, considering the information above, the best option to answer the question is letter C.