A good question.
1. As per the theory - fear of retaliation makes a would-be aggressor nation hesitate before attacking
2. Hence the nation that has to defense has to show the aggressor that its military power is greater than that of the aggressor
(A) A would-be aggressor nation can be deterred from attacking
only if it has certain knowledge that it would be destroyed in retaliation by the country it attacks.
Only is a strong word here. There can be other reasons too for not attacking.
INCORRECT
(B) A nation will not attack another nation if it believes that its own retaliatory power surpasses that of the other nation.
This is opposite of what is being talked about here
INCORRECT
(C) One nation’s failing to attack another
establishes that the nation that fails to attack believes that it could not withstand a retaliatory attack from the other nation.
Again, there might be other reasons that he nation did not attack. Establishing a a fact is pin pointing to a reason. This is too strong a usage.
INCORRECT
(D) It is in the interests of a nation that seeks deterrence and has unsurpassed military power to let potential aggressors against it become aware of its power of retaliatory attack.
CORRECT. This is what the argument is all about and resonates with our part 2.
(E) Maintaining maximum deterrence from aggression by other nations
requires that a nation maintain a retaliatory force greater than that of any other nation.
Requires again is a strong word. The nation can just tell plain lies to showcase its military power. It just needs to how the aggressors that it has more military power.
INCORRECT
In a CR questions, try to avoid strong words in the answer choices.