What Made the 1987 INF Treaty So Significant

What made the 1987 INF Treaty so significant?

A) It eliminated 2,500 U.S. and Soviet missiles from Europe, a major step toward ending the Cold War.
B) It eliminated an entire class of existing nuclear weapons, which was vital to the end of the Cold War.
C) It provided for on-site inspection to verify compliance on the part of both countries, a sign that each side was thawing in the Cold War.
D) All of these choices
E) None of these choices