Which of these is the only official language of Andorra?

Catalan is a Western Romance language derived from Vulgar Latin and named after the medieval Principality of Catalonia, in northeastern modern Spain. It is the only official language of Andorra, and a co-official language of the Spanish autonomous communities of Catalonia, the Balearic Islands and Valencia (where the language is known as Valencian). It also has semi-official status in the Italian comune of Alghero. It is also spoken in the eastern strip of Aragon, in some villages of the region of Murcia called Carche and in the Pyrénées-Orientales department of France. These territories are often called Països Catalans or "Catalan Countries".

Catalan evolved from Vulgar Latin in the Middle Ages around the eastern Pyrenees. 19th-century Spain saw a Catalan literary revival, culminating in the early 1900s.

Andorra, officially the Principality of Andorra (Catalan: Principat d'Andorra), also called the Principality of the Valleys of Andorra (Catalan: Principat de les Valls d'Andorra), is a sovereign landlocked microstate on the Iberian Peninsula, in the eastern Pyrenees, bordered by France to the north and Spain to the south. Believed to have been created by Charlemagne, Andorra was ruled by the count of Urgell until 988, when it was transferred to the Roman Catholic Diocese of Urgell. The present principality was formed by a charter in 1278.