For New England Colonies their activities are fishing, lumber and whaling.
For Middle Colonies they depend on agriculture (Mostly the production of wheat), shipping and trade.
Southern Colonies trade and agriculture (Mostly tobacco and cotton).
The concept of guided participation highlights that 
development occurs in a social situation while extending sociocultural beyond language-based dialogue.
D because it seams most logical
Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms. Currents are cohesive streams of seawater that circulate through the ocean.
The wheel, plow, and writing (a system which we call cuneiform) are examples of their achievements. The farmers in Sumer created levees to hold back the floods from their fields and cut canals to channel river water to the fields. The use of levees and canals is called irrigation, another Sumerian invention.
