Apowerful women's group has claimed that men and women differ in attitudes about sexual discrimination. a group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the united states. 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: πm - πw ≤ 0 versus h1: πm - πw > 0
b) h0: πm - πw ≥ 0 versus h1: πm- πw < 0
c) h0: πm - πw = 0 versus h1: πm - πw ≠ 0
d) h0: πm - πw ≠ 0 versus h1: πm - πw = 0