PLS HURRY, I NEED ANSWERSS, WILL GIVE BRAINLIEST

Which sentence is written in passive voice?

Nelson Mandela, a famous civil rights activist in South Africa, fought against apartheid, the separation of blacks and whites. In 1964, Mandela was sentenced to life in prison for his work against the South African government. Despite being locked away, Mandela continued to influence the anti-apartheid movement. In 1990, the president of South Africa, Frederik William de Klerk, freed Mandela from prison. In 1994, Mandela and President De Klerk established the country's first democratic elections. That year, the people of South Africa elected Nelson Mandela as the first black president.