The Advantage of the Herfindahl Index Over the Four- and Eight-Firm

The advantage of the Herfindahl index over the four- and eight-firm concentration ratios is that it provides information

A) on the degree to which foreign firms impact domestic competition.
B) about the dispersion of firm size in an industry.
C) on the degree to which marginal revenue is greater than marginal cost (for a firm) .
D) b and c
E) none of the above