A、effective B、in vain C、violent D、under control C

Thousands of South Korean protestors took to the streets of cities near Seoul, clashed with riot police in anti-Free Trade Agreement rallies. The demonstrators wielded sticks and threw rocks at Gwangju government buildings. They also set fire to property, demanding that the government stop free trade talks with the United States.
  South Korean media reports that some 72,000 protestors mainly farmers had joined fifteen separate rallies. Some one hundred protestors and riot police were injured and police took 27 protestors into custody. The protest is one of a longline of demonstrations by workers and farmers who fear the pact will destroy their livelihoods. South Korea hosted a fourth round of the talks on the trade during late October, and event pitches were also marred by violent protests, by farm activists, fishermen and unionists.  Negotiations between Seoul and Washington are expected to resume in December and are likely to stretch into next year. Differences between the sides still exist on opening up trade in farm goods, automobiles, textiles and pharmaceuticals.