From 1979 to 1989 in the United States, the number of working men grew 12% while the number of working women grew 29%.During this time, average wages for men fell slightly while average wages for women rose about 7%.Which of the following two explanations seems most consistent with the data?

a)Women decided to work more, raising their relative supply (relative to men).

b) Discrimination against women declined, raising the relative (to men) demand for female workers.