A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kgK to 0.4 kJ/kgK. At the same time, the entropy of the surroundings decreases form 80 kJ/K to 75 kJ/K. The process is
a) Reversible and isothermal
b) Irreversible
c) Reversible
d) Impossible