Correct Answer:
A. 2011
The correct answer is 2011. Usama bin Laden, the founder of al-Qaeda, was killed on 2 May 2011 in Abbottabad, Pakistan, during a covert operation by U.S. Navy SEALs. The operation, code‑named Operation Neptune Spear, was ordered by President Barack Obama. Bin Laden had been hiding in a compound in Abbottabad for approximately six years. His death marked a significant milestone in the global War on Terror. The options 2012, 2013, and 2014 are all incorrect because bin Laden was killed in 2011. Therefore, 2011 is the correct answer.