According to the u. s. bureau of labor statistics, in 2007 approximately of mothers with children under age 18 were in the workforce 71% 90% 25% 50%71

The last few decades have seen significant changes in the percentage of women's workforce, especially mothers with underage children,  most of whom are working full-time. For example, from March 1975 to March through March 2000, the percentage of mothers with children under the age of 18 rose from 47% to 73%. Thus, According to the data of the U.S. Bureau of Labor Statistics in 2007, this percentage is 71%.

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the answer is d. amendments.