<span>atmospheric perspective.
</span>
<span>Da Vinci is largely responsible for formulating the rules of the effects of light and air in the landscape. It was a </span><span>method of creating the illusion of depth, or
recession, in a painting or drawing by modulating color to simulate
changes effected by the atmosphere on the colors of things seen at a distance.</span>
I think the answer is (D)
<u>The right answer is:</u>
A. Investors purchased the stocks with little cash down, if the price dropped the investor had to repay the loan.
<u>Explanation: </u>
<em>Buying on margin is when you take out a loan to buy a stock, this process is also called leveraging your position, it basically means having a collateral. </em>
<em>
</em>
<em>When you buy on margin the stocks you buy are kept as collateral until you pay off the loan that makes them extremely risky.</em>
