For which of the following processes does the entropy of the system increase?
(a) the ripening of a banana,
(b) dissolution of sugar in a cup of hot coffee,
(c) the reaction of nitrogen atoms to form N2 molecules at 25 and 1 atm,
(e) formation of CH4 and O2 molecules from CO2 and H2O at room temperature and 1 atm of pressure?