57. An ideal gas undergoes a reversible isothermal expansion. Thechange in entropy △S of the gas versus the volume of the gas isshown on the right. When Y'is expanded from 0.5m3 to 2 m3. △S =3 J/K. How many moles are in the sample? (The gas constant isR-8.3 J.K-1·mol-1)
(A) 10 mol
(B) 49.8 mol
(C) 0.26 mol
(D) 3.74 mol
(E) 104.3 mol