What is an "ultimatum"?

An "ultimatum" refers to a final proposal or statement of conditions, often delivered in a context where one party wants to convey that this is the last offer or demand before further action is taken. The term is frequently used in negotiations or conflicts, where one party makes it clear that they will not engage in further discussions or negotiations and that acceptance or rejection of the ultimatum will lead to specific outcomes.

Understanding why this answer is correct rests on the common usage of the term in various contexts, such as diplomatic negotiations or interpersonal disagreements, where clear and definitive boundaries are set. The finality inherent in an ultimatum implies that it is a critical moment for decision-making, as no further offers will be made. Other choices such as exclusive rights over an invention, specific requirements in agreements, or acts of bravery do not capture this specific sense of finality and conditionality that defines an ultimatum.