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.

Let me give you an example: 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.
The answer to this example can be: c
Here is why: The passage describes the 704th's actions during Operation Market Garden.

OK. solve this:
Question: How many copies of Parkinson's Law have been sold in the United States? Passage:Parkinson divorced in 1952 and he married the writer and journalist Ann Fry (19211983), with whom he had two sons and a daughter. In 1958, while still in Singapore, he published his most famous work, Parkinson's Law, which expanded upon a humorous article that he had published in the Economist magazine in November 1955, satirising government bureaucracies. The 120-page book of short studies, published in the United States and then in Britain, was illustrated by Osbert Lancaster and became an instant best seller. It explained the inevitability of bureaucratic expansion, arguing that 'work expands to fill the time available for its completion'. Typical of his satire and cynical humour, it included a discourse on Parkinson's Law of Triviality (debates about expenses for a nuclear plant, a bicycle shed, and refreshments), a note on why driving on the left side of the road (see road transport) is natural, and suggested that the Royal Navy would eventually have more admirals than ships. After serving as visiting professor at Harvard University in 1958, the University of Illinois and the University of California, Berkeley in 195960, he resigned his post in Singapore to become an independent writer. To avoid high taxation in Britain, he moved to the Channel Islands and settled at St Martin's, Guernsey, where he purchased Les Caches Hall and later restored Annesville Manor. His writings from this period included a series of historical novels featuring a fictional naval officer from Guernsey, Richard Delancey, during the Napoleonic era.
Links: a. Osbert Lancaster b. Parkinson's law c. Napoleonic era d. Parkinson's law
Answer:
b