Explanation plz

The graph below shows the supply and demand curves for mohair, a wool obtained from angora goats. Government price supports were instituted during World War II, when a steady supply of wool was needed for soldiers' uniforms. The price supports are still in effect even though market conditions have changed. Using the straight-line tool, draw the lowest possible binding price floor you can, as a single horizontal line all the way across the graph from one edge to the other. To refer to the graphing tutorial for this question type, please click here. Price ($) 7.5 6.5 a 5.5 4.5 3.5 2.5 D N 15 05 Quantity (thousands)