Table 16-1
The following table shows the percentage of output supplied by the top eight firms in four different industries.

Firm Industry A Industry B Industry C Industry D
1 138% 18% 52% 23%
2 33 16 13 16
3 14 15 11 10
4 7 12 8 9
5 3 11 6 8
6 1 9 4 2
7 1 7 2 2
8 1 7 1 2

Refer to Table 16-1.What is the concentration ratio in Industry B?
a.18%
b.34%
c.61%
d.95%