Final answer:
The three industries that supported early settlement in the Atlantic region were fishing, shipbuilding, and agriculture, with each colonial region contributing in varying degrees to these sectors. The correct option is a.
Step-by-step explanation:
The three industries that helped the early settlers build communities in the Atlantic region were fishing, shipbuilding, and agriculture.
These industries were vital due to the environmental conditions and resources available in different colonial regions.
In the New England colonies, despite the poor soil and long winters leading to subsistence farming, the region thrived with its fishing and whaling activities, and became a leader in shipbuilding which was also aided by the southern colonies, notably North Carolina's timber industry.
The Mid-Atlantic colonies were more diverse in their agricultural practices, raising grains and livestock, and later leading in iron manufacturing.
The southern colonies were known for their tobacco production but also turned to other agricultural products and shipbuilding materials for economic growth. The correct option is a.