Which led most directly to the decline of the Latin language?

The following key reasons led directly to the decline of the Latin language:

1.The rise of literature

2.Interest in poetry

3.Vernacular language

4.The fall of the Roman Empire

Explanation:

From a search I made

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."