A powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. A group of 50 men and 40women were asked if thought sexual discrimination was a problem in the US.Of those sampled,11 of the men and 19 of the women did believe that sexual discrimination is a problem.Assuming W designates women's responses and M designates men's, which of the following are the appropriate null and alternative hypotheses to test the group's claim?

A. H0:_m-_w 0, H1:_m-_{w > 0}

B. H0:_m-_w0, H1:_m-_{w <0}

C. H0:_m-_w=0, H1:_m-_{w 0}

D. H0:_m-_w0, H1:_m-_{w =0}