[单选题]
According to the second law of thermogd)z6 0 nm,pufze,,fjdynamics, for any process that ma f*tlxmv a k2-m)myw+/y occur with lm2wx/ma yf*m)vkt-+ in an isolated system, which one of the choices applies?
A. Entropy remains constant.
B. Entropy increases.
C. Entropy decreases.
D. Both A and B are possible.
E. Both A and C are possible.