Given the task definition and input, reply with output. 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 many years did the Napoleonic Wars last? Passage:The regiment was sent to Portugal in August 1808 for service in the Napoleonic Wars and fought under General Sir John Moore at the Battle of Corunna in January 1809, before being evacuated to England later that month. It returned to the Peninsula in October 1810 where it fought at the Siege of Badajoz in March 1812, the Battle of Salamanca in July 1812 and the Battle of Vitoria in June 1813 as well as the Siege of San Sebastian in September 1813. It then pursued the French Army into France and saw action at the Battle of the Nivelle in November 1813 and at the Battle of the Nive in December 1813. It embarked for North America in June 1814 for service in the War of 1812 and saw action at the Battle of Bladensburg in August 1814, the Burning of Washington later in August 1814 the Battle of Baltimore in September 1814, and the Battle of New Orleans in January 1815, as well as the capture of Fort Bowyer in February 1815. It briefly returned to England in May 1815, before embarking for Flanders a few weeks later to fight at the Battle of Waterloo in June.
Links: a. Portugal b. War of 1812 c. Napoleonic Wars d. Battle of the Nive
c