Answer:
Correct answer is 2.Internal conflict
Step-by-step explanation:
First option is not correct as Canaan was not such a large kingdom, especially when compared to others that surrounded them.
Option 2 is correct as the kingdom was divided into two parts, because Solomon's successor wasn't able to preserve the unity of the country.
Option 3 is not correct as after Solomon's death his son Rehoboam took the throne, but wasn't able to rule for a long period.
Option 4 is not correct as they were conquered in the 8th Century BC, and this division happened in 10th Century BC.