What was significant about the participation in the 1980 Moscow Olympics?

The significance of the participation in the 1980 Moscow Olympics primarily lies in the complete boycott organized by several Western countries, including the United States. This boycott was a reaction to the Soviet Union's invasion of Afghanistan in December 1979. As a result, many nations chose not to send their athletes to compete, marking a historical moment in Olympic history where political tensions significantly influenced participation.

The absence of these athletes not only affected the competitive landscape of the Games but also underscored the extent of global political conflicts during that era, illustrating how events outside the realm of sports could dramatically impact international sporting events. This boycott was one of the largest in Olympic history and had a lasting effect on the Olympic Movement, demonstrating how politics and sports can intersect in profound ways.

In contrast, the other answer choices do not encapsulate the unique and defining element of the 1980 Moscow Olympics. While it is true that other Olympics have seen varied participation levels and the introduction of new sports, the complete and notable boycott is what made the 1980 event particularly significant.