Which one of  following is a true statement ?
a/ Alough theory  suggests the decline   of  unionizon should have increased income inequality ,empirical reserch suggests that the opposite occurred.

b/Alough theory suggests the deline of unionizon should have decreased income inequality ,empircal research suggests that the opposite occurred.

C/in theory ,the decline in unionzion may either reduce or increase income inequality ,however empirical reserch suggests it has increased it ,particularly among males.

D/in theory,the decline in unionization may either reduce or incerase income inequality ,hower empirical reserch suggests it has reduced it ,particularly among females.