Topco owns 60% of the voting common stock of Midco and 40% of the voting common stock of Botco. Topco wishes to gain control of Botco by having Midco buy shares of Botco's voting stock. Which one of the following minimum levels of ownership of Botco must Midco have in order for Topco to have controlling interest of Botco's voting stock?
A. 11%
B. 17%
C. 26%
D. 50+%