Final answer:
a) Formation in California during the 1940s. The Hells Angels motorcycle club was formed in California during the 1940s, an era that also saw the rise of many social and civil rights groups in the region.
Step-by-step explanation:
The origin of the Hells Angels is thought to be a formation in California during the 1940s. The post-World War II era in California, particularly in cities like Los Angeles and San Francisco, was a time of burgeoning social groups and movements.
While the Hells Angels themselves are a motorcycle club without direct links to LGBTQ organizations, the era was indeed characterized by the emergence of many such groups, including the Veterans Benevolent Association in 1945 and the Knights of the Clock towards the end of the 1940s.
The 1950s further saw the formation of the Mattachine Society, a pivotal organization in the fight for gay and lesbian civil rights. This era was marked by a greater acceptance of diversity and a challenge to social norms, which also facilitated the formation of many other social clubs and movements, including motorcycle clubs like the Satyrs, and eventually the more famous Hells Angels.