The second option makes the most sense.
Answer:
Spanish originated in the Iberian Peninsula as a dialect of spoken Latin, which is today called “Vulgar Latin,” as opposed to the Classical Latin used in literature. The dialect of Spanish that we consider dominant in Europe is called Castellano or Castilian Spanish.
During the Roman Empire, the Latin language was the official language on the peninsula (called “Hispania”), but it mixed with the local languages of the inhabitants, including Celts and Iberians, and began to take on its own uniqueness.
