5.5 mol ideal gas consisting of non-linear molecules at a pressure of 3.4 bar and a volume of 5.3 m³ undergoes an isobaric pressure change up to a volume of 3.8 bar without exchanging heat with the environment. What is the change in entropy of this gas? Select the correct answer from the following list:

a) -30.4 J/K

b) 45.6 J/K

c) .913e-1 kJ/k

d) -.609e-1 kJ/k