Sunderland Association Football Club is an English professional football club that plays in a championship referred to as the Sky Bet Championship for what reasons?
Sunderland A.F.C.: Sunderland Association Football Club ( , ) is an English professional football club based in the city of Sunderland, Tyne and Wear. Sunderland A.F.C.:  Sunderland currently plays in the EFL Championship, the second tier of English football. 2017–18 EFL Championship: The 2017–18 EFL Championship (referred to as the Sky Bet Championship for sponsorship reasons) is the second season of the EFL Championship under its current name, and the twenty-sixth season under its current league structure.
i don't know