The statements referred by the question are:
a) It convinced the United States to dismantle its nuclear weapons.
b) It proved that a naval blockade was not an act of war.
c) It showed Cuba that communism should be stopped.
d) It brought the world dangerously close to nuclear war.
The correct statement is D. Historians agree the Missile Crisis was the closest the world got to have a nuclear war between the U.S. and USSR. Nothing before or after this came as close to be direct aggression from one of these countries against the other.
Statements A and C never happened: the U.S. has nuclear weapons until today, and Cuba didn't give up on communism.
Statement B doesn't fit the facts around the Missile Crisis. The naval blockade didn't lead to war only because the U.S. was defensive.
Southerners approved the Dred Scott decision believing Congress had no right to prohibit slavery in the territories. Abraham Lincoln reacted with disgust to the ruling and was spurred into political action, publicly speaking out against it.
Explanation:
Asimov's thesis is that the beauty of science is the same as the beauty of nature. He expands on this theory with a grandeur explanation of the vast happenings in nature and the universe, such as the speed of light and sound, and the truth that the stars are really amazingly large suns like our own.
