When the Herfindahl-Hirschman Index for an Industry Is

When the Herfindahl-Hirschman Index for an industry is

A) very small, the industry can be perfectly competitive.
B) very large, the industry can be perfectly competitive.
C) 10,000, the industry is perfectly competitive.
D) very small, the industry can be a monopoly.
E) above 5,000, the industry is considered not very competitive, and when it is below 5,000, the industry is considered very competitive.