Answer: B) changes coming from technological advancements
Step-by-step explanation: In the first paragraph of Ronald Reagan's "Address to Students at Moscow State University," the phrase "the possibilities of tomorrow" refers to the changes coming from technological advancements.
Reagan delivered his speech in May 1988 at the end of the Cold War. In his address, he talked about the advances in technology in the United States and how they have opened up opportunities for freedom and entrepreneurship. He highlighted the role of technology in shaping the future and how it can contribute to the expansion of liberty across the world by bringing peace without conflict. Reagan's focus on the possibilities of tomorrow indicates his belief in the transformative power of technology and its potential to bring about positive changes in society.