In the 1950s, the U.S. leaders developed a negotiating style known as nuclear brinksmanship, meaning that they ______.
a. would only negotiate as equals with nations that possessed nuclear weapons
b. tried to force the Soviet Union to end the Cold War by threatening nuclear attack
c. refused to back down in a crisis, even if meant taking the country to the edge of nuclear war
d. would walk away from negotiations with the Soviet Union if threatened with nuclear war