Budapest again became the focus of national political drama in the late 1980s, when Hungary led the reform movement in eastern Europe that broke the communist monopoly on political power and ushered in the possibility of multiparty politics.
Question: In the late 1980s Budapest became the center of the reform movement.
yes

The Townsend Thoresen cross-Channel ferry Herald of Free Enterprise capsized outside the Belgian port of Zeebrugge on the 6th of March with the loss of 135 lives.
Question: 100 or more people lost their lives in a ferry sinking.
yes

The presence of oil in the South Atlantic was first proved in 1974, but the distance and isolation of the Falklands deterred oil companies from exploring the area until the 1990s.
Question: Petroleum is explored in the South Atlantic.
yes