What is equivalent?

You have experience matching stories to probability distributions. Similarly, you use the same procedure for two different A/B tests if their stories match. In the Civil Rights Act example you just did, you performed an A/B test on voting data, which has a Yes/No type of outcome for each subject (in that case, a voter). Which of the following situations involving testing by a web-based company has an equivalent set up for an A/B test as the one you just did with the Civil Rights Act of 1964?