Choose the correct a lternative to fill in the blanks respectively.

The spark that _______ the flame was a 3% hike in subway fares, but after 12 days of mass protests and street violence, Chile’s worst unrest in decades has transformed into a nationwide uprising _______ dramatic changes to the country’s economic and political system. Eighteen people _______ in the violence and 7,000 have been arrested amid widespread outbreaks of violence and arson, and credible allegations of human rights abuses by the security forces. The leaderless movement has forced the billionaire president, Sebastián Piñera, on the defensive, _______ him to replace eight ministers and announce a string of emergency measures including a small increase in the minimum wage and higher taxes on wealthy Chileans.

Source: https://www.theguardian.com/world/2019/oct/30/chile-protests-portraits-protesters-sebastian-pinera