The correct answer is B.
An ethnic group is a group of people that identify with each other based on similarities such as : common ancestry, language, society, history, religion, rituals and cuisine.
The Basques form a small, stateless nation of three million people on the French and Spanish sides of the northwestern Pyrenees.
Their language, Euskera, bears no relation to any other language in the world. Traditionally, the Basques has been mostly Roman Catholics.
The Basques are one of the oldest peoples in Europe, they have lived in the same place for more than 2000 years.