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单选题
This is the minimum flight speed at which the airplane is directionally and laterally controllable, determined in accordance with the Federal Aviation Regulations.
A
This is the smallest flight speed, and the plane can be operated at the speed directionally and laterally. The speed is suggested by the Federal Aviation Regulations.
B
The smallest flight speed, at which the airplane can be controlled directionally and laterally, is decided by and based on the Federal Aviation Regulations.
C
The smallest flight speed, at which the airplane can be controlled directionally and vertically, is made by the Federal Aviation Regulations.
答案解析
正确答案：B
