In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
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Question: Passage: In 2009 it was announced that the feature film Testament of Youth was in development by BBC Films and Heyday Films producer David Heyman, and was to be directed by James Kent. This had the support of the Vera Brittain Estate, Brittain's daughter Shirley Williams, and Brittain's biographer Mark Bostridge who is acting as consultant. Saoirse Ronan was cast to play Brittain in 2012 but was replaced in December 2013 when it was announced that Alicia Vikander would play Vera Brittain in the film which was released in late 2014 as part of the First World War commemorations. On 4 February 2014 Kit Harington joined the cast to play the role of Brittain's fiancé Roland Leighton. On 13 February 2014, Colin Morgan, Taron Egerton, and Alexandra Roach were announced to have joined the film's cast. An ensemble cast was later confirmed as filming began, including Dominic West, Emily Watson, Joanna Scanlan, Hayley Atwell, Jonathan Bailey and Anna Chancellor. It substituted Merton College, Oxford in the scenes showing Brittain's time as a student at Somerville College, arguing that filming in Somerville itself would been too difficult in light of the new buildings constructed there since the film's time period.
 Link Information: none Answer: none

Answer: Why was Saoirse Ronan replaced by Alicia Vikander?


Question: Passage: German Type IXD2 submarines were considerably larger than the original Type IXs. U-861 had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines plus two MWM RS34.5S six-cylinder four-stroke diesel engines for cruising, producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .
 Link Information: The range was extended to 31,500 nmi Answer: 7800

Answer: How much larger were the improved German submarines?


Question: Passage: Just south of the village center is Mount Prospect, summer home to Senator John W. Weeks, who sponsored congressional legislation creating White Mountain National Forest. In 1910, he purchased several farms to assemble the estate. It is now Weeks State Park, which features a fire lookout and his mansion, open for tours during the summer. A ski rope tow operates on the slope in winter. Many of the White Mountains and Green Mountains can be seen from the stone observation tower built in 1912 atop the summit. The Presidential Range is to the southeast, with the Franconia Range to the south. Mount Weeks, elevation , is in the Kilkenny Range to the northeast. It is named for the senator, as is the Weeks Medical Center. Weeks Memorial Library, a Beaux Arts landmark listed on the National Register of Historic Places in 2000, was given by John W. Weeks in memory of his father, William Dennis Weeks.
 Link Information:  Its most famous mountain is 6288 ft Mount Washington, which is the highest peak in the Northeastern U.S.  Answer: White Mountains

Answer:
Which range that can be seen from the stone observation tower built in 1912 is the biggest?