Answer:
B) Country C (Liechtenstein)
Step-by-step explanation:
The country that achieved independence through the declaration of a member of the royal family in Europe is Liechtenstein. Liechtenstein was granted independence in 1806 by the Holy Roman Emperor Francis II, after the Liechtenstein family had purchased the lordship of Schellenberg and county of Vaduz from the Austrian Empire. The Holy Roman Emperor declared the two territories as a sovereign state with the name "Liechtenstein" in honor of the Liechtenstein family. Therefore, Liechtenstein achieved independence through a declaration by a member of the royal family rather than through a revolution.