Gay Pride Month Commemorates the Beginning of the Modern Gay

Gay Pride Month commemorates the beginning of the modern gay rights movement which dates from

A) 1993, when President Clinton implemented the "Don't Ask, Don't Tell" policy, which permits gays to serve in the military but bans homosexual activity.
B) 1969, when riots which occurred in New York City in 1969 after police raided the Stonewall Inn, a gay bar.
C) 1973, when the American Psychiatric Association removed homosexuality from its official list of mental disorders.
D) 2005, when the Canadian parliament passed a bill legalizing gay marriage throughout the country.