Definition: 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.
Input: Question: What year was the battle of the Gap? Passage:After the D-Day invasion, was reassigned to IX Tactical Air Command (IX TAC) and directed to provide ground support for advancing United States First Army forces in France, attacking enemy targets initially in the Cotentin Peninsula, then supported Operation Cobra, the breakout of Normandy and attacked enemy forces in the Falaise-Argentan Gap. Wing headquarters and subordinate units operated primarily from liberated airfields and newly built temporary Advanced Landing Grounds in France, moved into north-central France, its groups attacking enemy targets near Paris then north-west into Belgium and the southern Netherlands. In December 1944/January 1945, engaged enemy targets on the north side of the Battle of the Bulge, then moved eastward into the Northern Rhineland as part of the Western Allied invasion of Germany.
Links: a. Falaise Pocket b. Falaise Pocket c. Paris d. Normandy landings
Output:
a