The correct answer is B) sending in tanks and troops to end the demonstrations.
In 1989 the government of China responded to the challenge of protests in Tiananmen square by sending in tanks and troops to end the demonstrations.
Chinese students were pacifically protesting in the Tiananmen square, demanding freedom of speech and democracy in China, when the government sent soldiers and tanks. Soldiers shot, killings many people and after the massacre, thousands of people were arrested. This incident occurred on June 4 and 5, 1989.
The other options of the question were a) halting trade with the West, c) allowing democratic elections, and d) calling for a special session of the United Nations Security Council.
