which of the following led Nelson Mandela and other anc members to use more militant tacticus as they struggled against apartheid members to use more militant tactius as they struggled against apartheid

The answer is: The increasing brutality and oppression of the apartheid regime.

During the 1950s and 1960s, Nelson Mandela and other members of the African National Congress (ANC) initially advocated for nonviolent resistance to the racist policies of the white-minority government in South Africa. However, as the government responded with even harsher measures, including mass arrests, torture, and killings, many activists became convinced that peaceful tactics were not enough to achieve their goals.

This led to a shift towards more militant tactics, including sabotage, guerrilla warfare, and even acts of terrorism. Mandela himself became a key figure in the armed struggle, leading the ANC's military wing, Umkhonto we Sizwe.

Ultimately, this approach helped to draw international attention and support to the anti-apartheid movement, and contributed to the eventual downfall of the apartheid regime in the 1990s. However, it also resulted in significant hardship and loss of life for many South Africans on both sides of the conflict.