The statement that best describes the comparison between the international reactions to the Rwandan genocide and the 9/11 attacks is:
The international community immediately responded to 9/11 but did not react to Rwanda until after the genocide occurred, based largely on differences in geography, culture, and political systems.
This statement accurately reflects the differences in the international response: the Rwandan genocide (which occurred in 1994) largely went unaddressed during its course despite the scale of atrocities, with the international community criticized for its inaction. In contrast, the 9/11 attacks (in 2001) elicited a rapid and unified response from many countries, primarily due to the immediate threat perceived and the global political dynamics following the attacks. The differences in reaction can indeed be attributed in part to geographical proximity, cultural awareness, and the political contexts of the two events.