Which organization consisted of white women engaging in non-violent resistance to apartheid?

The organization that consisted of white women engaging in non-violent resistance to apartheid is the Black Sash. This group was established in 1955 and was notable for its focus on issues of justice and human rights in the context of apartheid South Africa. The members, who often wore a black sash as a symbol of mourning for the loss of civil rights, organized peaceful protests and campaigns aimed at raising awareness about the injustices of the apartheid system. They were particularly vocal in opposition to pass laws and other discriminatory practices that affected not only black South Africans but also the wider struggle for equality and democracy.

In contrast, the other options represent different movements or organizations. The Black Consciousness Movement focused on fostering a sense of pride and identity among black South Africans rather than being centered on white women's activism. The ANC, or African National Congress, was a broader political organization that included members from various racial backgrounds and engaged in a range of activities, including armed resistance. The Women's League, part of the ANC, promoted women's rights and representation, but it did not specifically represent non-violent resistance led by white women alone. Therefore, the Black Sash stands out as the unique organization that fits the description provided in the question.