What did the 19th Amendment achieve?

The 19th Amendment to the United States Constitution, ratified in 1920, accomplished the significant milestone of granting women the right to vote. This amendment was a pivotal achievement in the women's suffrage movement, which sought to ensure that women had equal political rights and could participate fully in the democratic process. The passage of the 19th Amendment represented decades of activism and struggle by countless women and men who fought for gender equality in voting, thus fundamentally changing the landscape of American democracy.

While some of the other options mention important issues related to civil rights and equality, they do not pertain specifically to the focus of the 19th Amendment. For example, the ability for women to run for political office became more normative after gaining the right to vote but was not a direct outcome of this amendment. Similarly, marriage equality and discrimination in education are significant civil rights issues but were addressed through different legislation and court rulings in later decades. Therefore, the 19th Amendment specifically secured the right to vote for women, making option B the correct answer.