Vince and Twyla both worked at a non$-$unionized manufacturing plant. They started their jobs at the same time and did comparable jobs on the same shift. However, Vince made approximately $$65,000$ per year while Twyla earned roughly $$47,000.$ According to the text, what might be the explanation for this difference in pay?

Select the correct answer:

a$.$ Due to physical differences in physical strength and work capacity, males produce more marketable product than their female coworkers.

b$.$ Women are not paid at the same rate as men due to more sick days and anticipated maternity leaves.

c$.$ Women don't aspire to supervisory or management positions and don't take advantage of training opportunities that would give them a greater rate of pay.

d$.$ Employers still sometimes assume that men's incomes are necessary to support families, while women's income pay for luxuries in the family.