Question: During which season of the UK version of "The X Factor" did the group, who released the song "Black Magic", form?

Context paragraphs:
The X Factor (Australian TV series): The X Factor is an Australian television reality music competition, based on the original UK series, to find new singing talent.  The first season of the show premiered on Network Ten on 6 February 2005.  Ten dropped "The X Factor" after the first season due to poor ratings.  In 2010, the Seven Network won the rights to the show, and a second season went into production.  "The X Factor" was renewed after the highly successful "Australian Idol" was no longer broadcast on Network Ten.  "The X Factor" was produced by FremantleMedia Australia, and was broadcast on the Seven Network in Australia and on TV3 in New Zealand.  The program was cancelled after its eighth season in 2016.

List of The X Factor finalists (UK series 8): The eighth UK series of "The X Factor" was broadcast on ITV from 20 August 2011, with the live shows starting on 8 October 2011.  Girl group Little Mix were the winners, and the runner-up was Marcus Collins.  After "The X Factor", several of the contestants went on to release singles, including Little Mix, Collins, Amelia Lily, Misha B, Frankie Cocozza, The Risk and 2 Shoes.  On 25 July 2013, three contestants from series 8 - Little Mix, Amelia Lily and Misha B - were included in the (three-minute 41-second) X Factor Ultimate Mash-Up, a video trailer for series 10, a selection of 13 tracks and artists chosen to represent a decade of 'The X Factor' artists impact on the UK national chart.

X Factor (Swedish TV series): X Factor was the Swedish version of "The X Factor", with the only season of the series debuting on September 9, 2012 and ending on December 7, 2012.  The winner of the series was Awa Santesson-Sey.  TV4 announced in January 2013 that "Idol", another singing talent show seeking to discover the best singer through nationwide auditions, would return in 2013 and that "X Factor" will not continue.

Annastasia Baker: Annastasia Anneve Baker (born 16 November 1988) is a British Gospel singer, and song writer, Annastasia first caught the public eye as a contestant who progressed into the top six female singers in the judges round of the 2008 edition of The X Factor (UK series 5).  Undeterred by not getting past this stage, Annastasia subsequently auditioned for the X Factor 2010 series, The X Factor (UK series 7) and once again made it to the judges round.

Black Magic (song): "Black Magic" is a song by British girl group Little Mix.  It was written by Camille Purcell, Ed Drewett, Edvard Forre Erfjord, and Henrik Michelsen.  The Norwegian production duo Electric, who previously worked on the group's second studio album "Salute" (2013), produced the single with Matt Rad, who is additional producer.  It was released as the lead single from their third studio album, "Get Weird" on 21 May 2015.  "Black Magic" received critical acclaim from critics, who praised its upbeat and catchy sound and compared it to songs from their debut album, "DNA" (2012).

The X Factor (Arabic TV series): The X Factor Arabia originally aired in March 26, 2006 with the title "XSeer Al Najah", meaning Elixir or Essence of Success.  "XSeer Al Najah" was the Arab version of "The X Factor".  The Arabic-language version of the program also created by Simon Cowell has a similar format to the British version, in that there are judges who each have a team of contestants to mentor and compete with each other for the X Factor title.  The 14-episode first series was broadcast in 22 Arabic-speaking countries.  In its debut, it was known as being one of the most watched programs on television and was produced and supported by Rotana, one of the largest production companies in the Arab World.  The winner of "XSeer Al Najah" earned a chance to sign with Rotana.

Little Mix: Little Mix are a British girl group formed in 2011 during the eighth series of the UK version of "The X Factor".  They are the first and, so far, only group to win the competition.  Following their victory, they signed with Simon Cowell's record label Syco Music and released a cover of Damien Rice's "Cannonball" as their winner's single.  The members are Jade Thirlwall, Perrie Edwards, Leigh-Anne Pinnock, and Jesy Nelson.

X Factor (Albanian TV series): X Factor Albania is the Albanian version of "The X Factor", adapted from the original UK series to find new singing talent.  The first season started in January 8, 2012, and it is broadcast by TV Klan.  The judges are: Albanian singer from Macedonia Altuna Sejdiu, Albanian singer Soni Malaj, Albanian superstar Alban Skënderaj, and the famous composer Pandi Laço.  The show is hosted by Alketa Vejsiu.  She applied to acquire the rights of the show along with Top Channel and TV Klan.  Syco TV gave the rights to her, then she sold parts of the rights to TV Klan.  After losing the rights of "The X Factor", Top Channel acquired the rights of the talent show, "The Voice".

X Factor Adria: X Factor Adria, usually referred simply as X Faktor, is a Balkan production of international talent show franchise of "The X Factor".  The Adria edition of the show covers Serbia, Montenegro, Bosnia and Herzegovina, Macedonia and as of Season 2 Croatia as well, making the show regional.  The 2nd Season is hosted by Antonija Blaće, Aleksandar Radojičić and Snezana Velkov.  Like the original British version of the show, "X Factor Adria" is a music competition to find new singing talent, contested by aspiring singers drawn from public auditions.

X Factor Around the World: X Factor Around the World is the 24th anniversary television special of RCTI, joining four continents' biggest versions of "The X Factor" reality singing competition—"X Factor Indonesia" (Asia), "The X Factor USA" (America), "The X Factor UK" (Europe) and "The X Factor Australia" (Australia).  The show was originally aired on 24 August 2013 in Indonesia and featured performances by six winners and runners-up: Melanie Amaro, Samantha Jade, The Collective, Jahmene Douglas, Fatin Shidqia, Novita Dewi.

Supporting paragraphs: Black Magic (song) Little Mix
Answer: eighth