Use the quote to answer the question that follows: "Ronald Reagan won the Cold War without firing a shot." -- Former British Prime Minister Margaret Thatcher
This quote refers to the way that:

a. President Reagan ended the Cold War without military action.

b. the U. S. used nuclear weapons instead of guns to end the Cold War.

c. Reagan used trade embargoes to end the Cold War.

d. Great Britain ended the Cold War before the U. S. had to intervene