Answer:
D
Step-by-step explanation:
A. Basque does have their official language Basque (although endangered)
B. They had visited Spain approximately 5 years ago
C. Basques are indigenous to, and primarily inhabit, an area traditionally known as the Basque Country (Basque: Euskal Herria) — a region that is located around the western end of the Pyrenees on the coast of the Bay of Biscay and straddles parts of north-central Spain and south-western France.
D. They have worked hard to preserve themselves and are giving efforts to revive their language so this is the correct answer