Consider a firm that has dual-class shares with 250 million Class A shares (having 1 vote each) and 75 million nonlisted Class B shares having 8 votes each. The shares are otherwise identical. If one requires 51 percent of the votes to control the firm, what number of Class B shares must one control?

A. 54.2 million

B. 51 million

C. 37.5 million

D. 162.5 million