I think it's either committee or precinct, not totally sure.
The mayor-council form of city government merges executive and legislative functions in a single group of officials. This is common in lots of smaller towns.
It should be 1929 - 1932 because that's when it dropped the most. All of the other choices have sections where it rises back up.
Answer: Both the Chesapeake and Southern colonies had been made of a majority of single, young, white guys who labored as indentured servants. After Bacon's Rebellion, the Chesapeake and Southern colonies moved toward the usage of enslaved employees introduced from West Africa.