Table $17-1$

The following table shows the output produced by each of the top eight firms in four industries as well as the total industry output for those industries.

$$

Firm Industry A Industry B Industry C Industry D

$150,00018,00037,00040,000$

$247,00017,75036,50039,000$

$343,00017,25035,50037,000$

$438,00016,50034,00034,000$

$532,00015,50032,00030,000$

$625,00014,25029,50025,000$

$717,00012,75026,50019,000$

$88,00011,00023,00012,000$

Total $270,000130,000300,000250,000$

$$

$$

Refer to Table $17-1.$ Which industry has the highest concentration ratio?

a$.$ Industry C

b$.$ Industry B

c$.$ Industry A

d$.$ Industry D