What change was made when F. W. de Klerk became president of South Africa in 1989?

All pass laws ended.

All schools were integrated.

All prisoners were freed.

All adults could now vote.

the change that was made when F. W. de Klerk became president of South Africa in 1989 would be: All adults could now vote

Due to apartheid, The black colored citizens in South Africa did not hold the same rights as the white colored citizen, including the right to vote. After he became president, all adults from all color gained the right to vote and choose their representative in the Government.