According to the accompanying graph, if the price is $20, there is a ________ of ________ units.
a. surplus; 100
b. surplus; 150
c. shortage; 100
d. surplus; 50
e. shortage; 50
![According to the accompanying graph if the price is 20 there is a of units a surplus 100 b surplus 150 c shortage 100 d surplus 50 e shortage 50 class=](https://us-static.z-dn.net/files/de4/0ceeee9c813ce4b3207d85d7254b9538.jpg)