Answer:
Tuscan Dialect. Latin Language
Step-by-step explanation:
Dante Alighieri was an Italian writer and poet who lived in the 13th century.
During his time, Latin was the language that was spoken in the continent of Europe of which Italy was and is still a part of.
However, Latin language was spoken by the elites - the most educated in the society. Those who were not educated spoke in vernacular or dialects such as Tuscan Dialect.
To bridge the gap between the educated and non-educated, Dante wrote his poems in the vernaculan Tuscan Dialect to communicate with those who were not fluent in the Latin language.