Q:Information: - The Swedish football league system is a series of interconnected leagues for club football in Sweden which is controlled by the Swedish Football Association and consists of 288 teams in 22 leagues divided into five levels. Below those five levels, additional regional levels numbered six to ten exist but these lower leagues are controlled by the regional associations and not by the nationwide association. There is, however, promotion and relegation to and from all levels. As of 2013, there were a total of 2510 teams in the Swedish league system of which 299 of them were reserve teams. - Helsingborg (spelled Halsingborg between 1912 and 1970) is a town and the seat of Helsingborg Municipality, Scania, Sweden. It had 132,989 inhabitants in 2013. Helsingborg is the centre of the northern part of western Scania. There is no formal metropolitan area, but the municipality of Helsingborg City and its neighbouring five municipalities (within Scania) had in spring of 2013 a population of 269.489 inhabitants at an area of , a population density of 200 people/km. This makes Helsingborg the fourth largest population area in Sweden. The city is also Sweden's closest point to Denmark, with the Danish city Helsingr clearly visible on the other side of the resund about to the west, closer than to the city's own remoter areas. If including all population around the northern part of resund, as a Helsingborg-Helsingr metropolitan area, its population increases to 732.450 at an area of . The busy ferry route, known as the HH Ferry route has through history been operated by several shipping lines. more than 70 car ferries departures from each harbour every day. - Helsingborgs IF (alternative spelling Halsingborgs IF), commonly referred to as Helsingborg, or (especially locally) HIF, is a Swedish football club located in Helsingborg. They are currently playing in the second highest Swedish league, Superettan. The club, formed 4 June 1907, has won five national championship titles and five national cup titles. Helsingborgs IF have also won Allsvenskan on two occasions when the title of Swedish champions was not decided by the outcome of that league. - Martin Christensen ( born 23 December 1987 ) is a Danish professional footballer , who curretntly plays for the Allsvenskan team Helsingborgs IF , joining the club from Atvidabergs FF at the start of the 2016 season . He played 28 games and scored three goals for various Danish national youth teams from 2005 to 2008 . - Kopparvallen is a multi-use stadium in Atvidaberg, Sweden. It is used mostly for football matches and is the home stadium of Atvidabergs FF. The stadium holds 8,000 people and was built in 1907. Famous football players who have played in the arena is Ralf Edstrom, Roland Sandberg, Conny Torstensson, Zlatan Ibrahimovic and Pele. - Atvidaberg is a locality and the seat of Atvidaberg Municipality, Ostergotland County, Sweden with 6,859 inhabitants in 2010. The name is a compound word which can be translated as "towards wide mountains" or, jokingly, "ate wide mountains", thanks to the homonym nature of the Swedish word "at". - Atvidabergs Fotbollforening, also known simply as Atvidabergs FF, Atvidaberg, Atvid or (especially locally) AFF, is a Swedish professional football club based in Atvidaberg. The club is affiliated with Ostergotlands Fotbollforbund and plays their home games at Kopparvallen. The club colours, reflected in their crest and kit, are blue and white. Formed on 1 July 1907 as Atvidabergs IF, the club was most successful during the 1970s when they won two national championship titles and two national cup titles. With a population of around 7000, Atvidaberg is the smallest town ever to bring home a Swedish league title. They currently play in Superettan, where the season lasts from April to November. - Allsvenskan (also known as Fotbollsallsvenskan) is a Swedish professional league for men's association football clubs. It was founded in 1924, and is the top flight of the Swedish football league system, operating on a system of promotion and relegation with Superettan. Seasons run from late March or early April to beginning of November, with the 16 clubs all meeting each other twice, resulting in a 30-match season, for a total of 240 matches league-wide. After reading the paragraphs above, we are interested in knowing the entity with which 'martin christensen' exhibits the relationship of 'country of citizenship'. Find the answer from the choices below. Choices: - denmark - sweden
A:
denmark