The statement that best compares an armistice to a peace treaty is : "An armistice is a cease-fire agreement, while a peace treaty is a negotiation for peace." Option D is correct.
An armistice constitutes a formal agreement of warring parties to stop fighting. However, it is not the end of a war, since it may marked only a cessation of hostilities while an attempt is made to negotiate a lasting peace.
A peace treaty constitute an agreement between two or more hostile parties, usually countries or governments, which formally ends a state of war between the parties.