<span>D.The Brandt Line theory was developed by an American economist.</span>
Collateral. You can borrow money against a house or car, but if you default and don't pay it back you will lose the house or car, or whatever you used as collateral.
B is the answer to your question
The total amount of money in circulation or in existence in a country.
D, because the South's economy depended mostly on agriculture
