What is the central idea of the passage? War by William Graham Sumner

The Monroe Doctrine is an exercise of authority by the United States over a controversy between two foreign states, if one of them is in America, combined with a refusal of the United States to accept any responsibility in connection with the controversy. That is a position which is sure to bring us into collision with other States, especially because it will touch their vanity, or what they call their honor — or it will touch our vanity, or what we call our honor, if we should ever find ourselves called upon to "back down" from it. Therefore it is very true that we must expect to need a big navy if we adhere to the doctrine. What can be more contrary to sound statesmanship and common sense than to put forth an abstract assertion which has no definite relation to any interest of ours now at stake, but which has in it any number of possibilities of producing complications which we cannot foresee, but which are sure to be embarrassing when they arise! What has just been said suggests a consideration of the popular saying, "In time of peace prepare for war." If you prepare a big army and navy and are all ready for war, it will be easy to go to war; the military and naval men will have a lot of new machines and they will be eager to see what they can do with them. There is no such thing nowadays as a state of readiness for war. It is a chimera, and the nations which pursue it are falling into an abyss of wasted energy and wealth. When the army is supplied with the latest and best rifles, someone invents a new field gun; then the artillery must be provided with that before we are ready. By the time we get the new gun, somebody has invented a new rifle and our rival nation is getting that; therefore we must have it, or one a little better. It takes two or three years and several millions to do that. In the meantime somebody proposes a more effective organization which must be introduced; signals, balloons, dogs, bicycles, and every other device and invention must be added, and men must be trained to use them all. There is no state of readiness for war; the notion calls for never-ending sacrifices. It is a fallacy. It is evident that to pursue such a notion with any idea of realizing it would absorb all the resources and activity of the state; this the great European states are now proving by experiment.

A.) A nation cannot expect peace by making preparations for war

B.) A state of peace will always lead to a state of war

C.) War is essential for the advancement of human society

D.) War is beneficial only to arms and weapons manufacturers

E.) Mankind is driven by its primal nature to engage in conflict

ITS PLATO