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

the democratic and republican parties

explanation:

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.