This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Passage: The U.S. Army currently consists of 10 active divisions as well as several independent units. The force is in the process of contracting after several years of growth. In June 2013, the Army announced plans to downsize to 32 active combat brigade teams by 2015 to match a reduction in active duty strength to 490,000 soldiers. Army Chief of Staff Raymond Odierno has projected that by 2018 the Army will eventually shrink to "450,000 in the active component, 335,000 in the National Guard and 195,000 in U.S. Army Reserve."
How many divisions are there in the U.S. Navy?

Passage: Wildfires plague the forested areas of Guam every dry season despite the island's humid climate. Most fires are man-caused with 80% resulting from arson. Poachers often start fires to attract deer to the new growth. Invasive grass species that rely on fire as part of their natural life cycle grow in many regularly burned areas. Grasslands and "barrens" have replaced previously forested areas leading to greater soil erosion. During the rainy season sediment is carried by the heavy rains into the Fena Lake Reservoir and Ugum River, leading to water quality problems for southern Guam. Eroded silt also destroys the marine life in reefs around the island. Soil stabilization efforts by volunteers and forestry workers (planting trees) have had little success in preserving natural habitats.
What are 20% of fires resulting from?

Passage: In the 1890s, the University of Chicago, fearful that its vast resources would injure smaller schools by drawing away good students, affiliated with several regional colleges and universities: Des Moines College, Kalamazoo College, Butler University, and Stetson University. In 1896, the university affiliated with Shimer College in Mount Carroll, Illinois. Under the terms of the affiliation, the schools were required to have courses of study comparable to those at the university, to notify the university early of any contemplated faculty appointments or dismissals, to make no faculty appointment without the university's approval, and to send copies of examinations for suggestions. The University of Chicago agreed to confer a degree on any graduating senior from an affiliated school who made a grade of A for all four years, and on any other graduate who took twelve weeks additional study at the University of Chicago. A student or faculty member of an affiliated school was entitled to free tuition at the University of Chicago, and Chicago students were eligible to attend an affiliated school on the same terms and receive credit for their work. The University of Chicago also agreed to provide affiliated schools with books and scientific apparatus and supplies at cost; special instructors and lecturers without cost except travel expenses; and a copy of every book and journal published by the University of Chicago Press at no cost. The agreement provided that either party could terminate the affiliation on proper notice. Several University of Chicago professors disliked the program, as it involved uncompensated additional labor on their part, and they believed it cheapened the academic reputation of the university. The program passed into history by 1910.

In what decade did the U of C affiliate with numerous national colleges?