Final answer:
The American Federation of Labor did not focus on just one goal to improve working conditions; instead, it had multiple objectives such as increasing wages, reducing work hours, and ensuring safer work environments. option b.
Step-by-step explanation:
The statement that the American Federation of Labor (AFL) focused on one goal to improve working conditions in the United States is false. The AFL, founded by Samuel Gompers, aimed to address multiple labor issues. Its primary objectives included increasing wages, reducing work hours, and establishing safer working conditions. Additionally, it sought a closed shop, where only union members would be employed, and used strikes as a tactic to achieve its goals. By 1914, the AFL had grown significantly, reaching over 2 million members due to its successes in improving labor conditions.