What major issue was Susan B. Anthony a prominent activist for?

Susan B. Anthony was a key figure in the women's suffrage movement in the United States, advocating for women's right to vote. Her activism began in the mid-19th century, and she played a crucial role in mobilizing women and garnering support for the suffrage cause. Anthony believed that the ability to vote was essential for women to gain equality and influence in society. She worked tirelessly to raise awareness, organize campaigns, and push for legislation that would grant women the right to participate in the electoral process. Her efforts laid the groundwork for future advancements in women's rights and ultimately contributed to the passing of the 19th Amendment in 1920, which granted women the right to vote nationwide.

The other choices, while significant social issues, are not central to Anthony's legacy. Labor rights, child labor laws, and civil rights for men were important matters, but they were not the primary focus of her activism.