Answer:
Wikipedia defines formal sector as activities which are taxed and monitored by the government and the activities involved are included in the Gross Domestic Product(GDP).
Explanation:
In contrast to formal economy is the informal sector which is neither taxed nor included in the GDP and Gross national product (GNP) of a country.
This is geography not math
C. Fishing
I think fishing would make sense due to living in a river valley.
The answer on the test I took said mass wasting was the right answer