[单项选择]If the average woman makes 77% of what a man makes for equal work, maybe she should only pay 77% for the purchases she makes as well. That’s the idea behind a six-week campaign pioneered by Lean In DC, the local chapter (分会) of Sheryl Sandberg’s Lean In movement. The group convinced about a dozen local businesses to offer 23% discounts to customers on Tuesday, which is Equal Pay Day, as a way of raising awareness of the gender pay gap and highlighting the differences that can exist between men’s and women’s paychecks. Equal Pay Day marks the symbolic point in the year when women’s earnings catch up with their male peers’—that is, a woman would have to work from January 1, 2013 until April 8, 2014 to make what a man made in 2013 alone. "Hearing those same old numbers every year is bound to cause some fatigue," says Madeline Meth, 24, the Lean In group’s founder and president, whose day job is in media relations at the Center for American Progress. "That was the idea behin A. Not all businesses offer the discount in a full scope. B. Not many businesses support this campaign. C. Their discount sales are only restricted to the DC area. D. These businesses are all local but famous ones.