I believe the answer is:
"more social organization"
"surplus food"
"fewer technical advances"
and "depletion of the soil",
Agrarian societies would focused it's main activities around the agricultural process. In this society, people are required to interact and divide their works with very minimum technologies. The activities often require constant land extraction that could cause depletion of the soil. But, this society tend to had high food storage due to its focus on agriculture.