How did the death of Chinese leader Hu Yaobang in 1989 lead to the protests in Tiananmen Square?

1) As a reform leader, Hu Yaobang had tried to transform China's government into a democracy with free and open elections.

2) Students in China were hesitant to trust any communist leader, and Hu Yaobang's treachery was the final straw that led to revolt.

3) Students came out to demonstrate against the assassination of Hu Yaobang and demand that his killer be brought to justice.

4) Activists in the democratic movement in China occupied Tiananmen Square to mourn Hu Yaobang's death and demand more reforms.