False, people don’t trust each other less today because of slave trade
Roads were nothing more than dirt paths that were dry and dusty during the summer and muddy during the winter
-historylink101.com (Travel by Land in Ancient Greece)
The answer is 2: to increase the amount of land available for agriculture.
Reason:
If I remember correctly from Geography last year that is called terrace farming. Common practice in hilly areas where you would be unable to plant crops. Instead, they flatten that out and have “steps” that gives them flat land to grow crops, often rice.