What Was the Uprising of Twenty Thousand in 1909

What was the uprising of twenty thousand in 1909?

A) A strike by women garment workers in New York City who were protesting low wages,dangerous working conditions,and management's refusal to recognize their union
B) A strike by steelworkers in Pennsylvania who were protesting low wages and inhumane working conditions
C) A walkout of public-school students in Boston who were protesting the physical conditions of the schools
D) A nationwide walkout of workers in the meatpacking industry who were protesting unsanitary working conditions and low wages