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.

Example input: 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-Loduring 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,
. Links: a. Allies of World War II b. Wesel c. Operation Market Garden d. Air Support.
Example output: c
Example explanation: The passage describes the 704th's actions during Operation Market Garden.
Q: Question: Which of the tournaments that Serena Williams' played in 1997 in the qualifying round is the oldest? Passage:Williams played the qualifying rounds of her first three tournaments of 1997, in the first round of State Farm Evert Cup, third round of Acura Classic and second round of European Indoor Championships, to Alexia Dechaume-Balleret, Magui Serna and Dominique Monami respectively. She then qualified for her first tour main draw when she defeated Magui Serna in the final round of qualifying at the Kremlin Cup, but lost in the first round of the main draw to compatriot Kimberly Po. She then entered the Ameritech Cup as a wild card and ranked no. 304. She earned her first main draw win against then world no. 27 Elena Likhovtseva in straight sets. In the next round, she upset world no. 7 Mary Pierce in two tight sets, with Williams failing to serve it out in the twelfth game of the second set but eventually won in a tie-break. In the quarterfinal she upset world no. 4 Monica Seles easing through the second and third sets, recording her first career wins over top 10 players and becoming the lowest-ranked player in the open era to defeat two top 10 opponents in one tournament. She ultimately lost in the semifinals to world no. 5 Lindsay Davenport 4-6 in both sets.
Links: a. Monica Seles b. Ameritech Cup c. Indian Wells Masters d. Zurich Open
A:
c