In which of the following languages were most books written before Renaissance?

Most books written before the Renaissance were written in Latin.

Here's why:

* Latin was the language of scholarship and learning: It was the official language of the Roman Empire and used in the Church, universities, and government throughout the Middle Ages.

* Other languages were used, but less widely: While some books were written in vernacular languages (like Old English, French, or Arabic), Latin was the dominant language for scholarly works and religious texts.

The Renaissance saw a shift towards vernacular languages, but Latin remained important for centuries.