The sentence uses the word "negotiation" correctly the peace negotiation was successful as both sides came to an agreement. Thus the correct answer is D.
What is negotiation?
Negotiation is referred to as a procedure that helps to reach an agreement between both the parties involved in conflicts by mutual consent or by conducting a settlement where they both achieve something in return.
The parties will have the chance to create an understanding that matches their objectives through negotiation. The relationship between the parties may be preserved during negotiations, and in some situations even improved.
In statement D clearly reflects that both reached to agreement successfully in a peaceful manner which is an element of negotiation.
Therefore, option D of The peace negotiation was successful as both sides came to an agreement that is appropriate.
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