A researcher is examining the relationship between color preferences and gender. A sample of 40 men and 60 women is obtained and each person is asked to identify his/her preference between two choices of paint colors for a new student lounge. For this sample, 15 of the men preferred color A, and 35 of the women preferred color A. If a chi-square test is used to evaluate the relationship, what is the expected frequency for men preferring color A? a. 20 b. 25 c. 40 d. 50