Please answer this question with reference to a graph so I can better understand!

13. Suppose a market has demand represented by QD = 500 - 10 P and supply represented by QS = 10 P -

100. If a price ceiling of $20 is imposed, the impact on the market will be

A. A shortage of 200 units.

B. A deadweight loss of $1000.

C. A consumer surplus of $500.

D. A & B

E. A & C

F. B & C

G. A & B & C

H. None of the above