Suppose That There Are Two Industries, a and B

Suppose that there are two industries, A and B.There are five firms in industry A with sales at $5 million, $2 million, $1 million, $1 million, and $1 million, respectively.There are 4-firms in industry B with equal sales of $2.5 million for each firm.The HHI for industry B is:

A) 2,500.
B) 1,800.
C) 3,200.
D) 2,800.