Answer:
The correct answer is C) the fall of Communist states in Europe
Step-by-step explanation:
The Tienanmen Square Protests were a student-led protest concentrated mainly in Beijing's main city square.
The students were protesting against the communist state in China and it's authoritative control on every aspect of a citizens life. There was no free speech, no democratic election and little other freedoms.
The fall of the Communist States in Europe would have had the greatest impact on these protesters. They had witnessed how protests had begun in Eastern Europe against Soviet intervention and believed they were part of a larger cause.
The other options in the list are not applicable. For example, Mao died in 1976, way before the protests took place.