Refer to the Following Paragraph to Answer the Questions Below

Refer to the following paragraph to answer the questions below.
Mary Rodale studied discrimination against women plumbers. She hypothesized that individuals who believe strongly in traditional sex roles would be more discriminatory than individuals who showed strong non-traditional sex roles. She contacted 100 individual home owners who planned to hire a plumber. She offered each subject six possible plumbers to choose from. The plumbers had varying levels of experience and training and charged different rates. One of the six was a woman and the other five were men. Every single home owner who believed strongly in traditional sex roles chose a male. All those who believed in non-traditional sex roles ignored gender and chose on the basis of skill and price alone.
-What is the null hypothesis for the study?

A) There is no discrimination by homeowners against women plumbers.
B) Men and women both discriminate against women plumbers.
C) Traditionalist homeowners are more likely to discriminate against women who are plumbers.
D) Regardless of sex role values, all homeowners discriminate against women plumbers.