The most accurate response would be:
The protests in East Germany in 1989 were part of a larger trend of successes in anti-communist activism in neighboring countries, making it harder for the government to continue to deny citizens’ civil rights. China was more isolated from this larger trend so its government was able to assert firmer control over protests.
This response effectively highlights the contrasting influences of international events on the two countries. In East Germany, the protests were influenced by a regional wave of anti-communist sentiment in Eastern Europe, which contributed to the eventual fall of the Berlin Wall and the expansion of civil liberties. In contrast, China, facing less immediate regional pressure from similar successful movements at that time, was able to maintain a more repressive stance following the Tiananmen Square protests, illustrating its ability to assert stronger control without the same level of external influence.