You will be given a definition of a task first, then some input of the task.
In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: How much time had passed between Henry II's declaration of war against Charles V and the signing of the Treaty of Chambord? Passage:Dissatisfied with the Interim decreed by Charles V at the 1548 Diet of Augsburg, the insurgents were full of resolution to defend Protestantism andnot leasttheir autonomy against the Imperial central authority. They agreed to establish contacts with the Catholic French king Henry II, disregarding his oppression of the Protestant Huguenots. In autumn Henry declared war against Charles V and prepared to march against the Empire up to the Rhine River. On 15 January 1552, he signed the Treaty of Chambord with Maurice of Saxony and his Protestant allies, whereby the French conquests were legitimised ahead of time. The princes acknowledged the king's lordship as "Vicar of the Empire" over the Imperial cities of Metz, Toul and Verdun, as well as Cambrai "and other towns of the Empire that do not speak German". The insurgents in turn received subsidies and military assistance from the French, their troops moved into the Habsburg hereditary lands and laid siege to the emperor at Innsbruck, while his brother Ferdinand I entered into negotiations that led to the revocation of the Augsburg Interim by the 1552 Peace of Passau.
Links: a. Metz b. Treaty of Chambord c. Treaty of Chambord d. Italian War of 15511559
Output:
d