A protest at Tiananmen Square in 1989 convinced China’s leaders to a.expand participation in government. b.crack down on democratic protests. c.expand the right to free speech. d.crack down on Communist protests.

Answer :

A protest at Tiananmen Square in 1989 convinced China’s leaders to "b.crack down on democratic protests", however these protests drew world-wide attention and drew criticism of the Chinese regime. 
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crack down on democratic protests.