Suppose a Ten Firm Industry Has Total Sales of $35

Suppose a ten firm industry has total sales of $35 million per year. The largest firm have sales of $10 million, the third largest firm has sales of $4 million, and the fourth largest firm has sales of $2 million. If the rest of the industry has annual sales of $12 million, the second largest firm has sales of

A) $8 million.
B) $7 million.
C) $4 million.
D) none of the above.