Listed in the table are the long-run total costs for three different firms.
Quantity 1 2 3 4 5
Firm A 100 100 100 100 100
Firm B 100 200 300 400 500
Firm C 100 300 600 1000 1500
Which firm is experiencing diseconomies of scale?
a. Firm A and Firm B only
b. Firm B only
c. Firm C only
d. Firm A only