Who addressed the National FFA Convention in 1991?

The correct answer is George Bush, who addressed the National FFA Convention in 1991. His speech highlighted the importance of agriculture and the future of the agricultural education system in the United States. As the sitting president at the time, his presence underscored the relevance of FFA and the critical role that young agricultural leaders play in shaping the future of the nation's food and fiber systems.

The context of his address occurred during a period when agricultural education was gaining increasing recognition in American society, making his participation significant for the members of the Future Farmers of America. The other options represent presidents who did not speak at that particular convention. Bill Clinton and Barack Obama were not in office in 1991, while Ronald Reagan addressed the National FFA Convention earlier in the 1980s, thus not coinciding with the specific event in question.