In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Q: Statement: As you know, the Roman and the Ottoman empires suffered from grave internal weaknesses but persisted for centuries. Choices:  1. Despite serious internal weaknesses, the Roman empire persisted for centuries.  2. The Roman and Ottoman empires suffered from the same internal weaknesses.  3. No one realizes that the Roman empire had serious internal weaknesses. 
A: 
3