Which set of events is listed in chronological order?

The correct answer to the question is the letter B.  And the chronological order is as follows:

1. Daughters of Bilitis (DOB) was formed in 1955 in San Francisco, California as a social alternative to lesbian groups who were subject of discrimination and public hostility.

2. Proposition 8 was passed on November 4th of 2008. In favor of eliminating same sex marriage.

3. Ruling by EEOC was done on April 20 of 2012 where the federal agency in charge of enforcing employment discrimination laws, declared that anti-trans bias was sex discrimination under title VII.