You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? Passage: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lo during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
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Solution: During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen.
Why? The passage describes the 704th's actions during Operation Market Garden.

New input: Question: Which professor who were Walker's mentors at Spelman was born first? Passage:As the schools in Eatonton were segregated, Walker attended the only high school available to blacks: Butler Baker High School. She went there to become valedictorian and enrolled in Spelman College in 1961 after being granted a full scholarship by the state of Georgia for having the highest academic achievements of her class. She found two of her professors, Howard Zinn and Staughton Lynd, to be great mentors during her time at Spelman, but both were transferred two years later. Walker was offered another scholarship, this time from Sarah Lawrence College in New York, and after the firing of her Spelman professor, Howard Zinn, Walker accepted the offer. Walker became pregnant at the start of her senior year and had an abortion; this experience, as well as the bout of suicidal thoughts that followed, inspired much of the poetry found in Once, Walker's first collection of poetry. Walker graduated from Sarah Lawrence in 1965.

Solution:
She found two of her professors, Howard Zinn and Staughton Lynd, to be great mentors during her time at Spelman, but both were transferred two years later