San Francisco was a focus for Asian American reformers in the 1960s because it was where many Asian immigrants opposed reform efforts. where many Asian immigrants had entered the United States. a location of Japanese American internment during World War II. where the Chinese Exclusion Act had been signed.

it was where many Asian immigrants opposed reform efforts

Explanation:

Asian American reformers in the 1960s focused majorly on Sam Francisco simply because it was believed that many Asian immigrants that are living in the city of San Francisco are heavily involved in the illicit and exasperating job, in the course of developing the American economy.

Thereby, due to the large involvement of the Asain immigrants in San Francisco, it can be concluded that "San Francisco was a focus for Asian American reformers in the 1960s because it was where many Asian immigrants opposed reform efforts."

im going to go with b.