How many of the Americans are left handers? The reason why so few are left-handed ______.

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问题 How many of the Americans are left handers?
The reason why so few are left-handed ______.

选项 A、has nothing to do with heredity
B、remains one of the great unsolved mysteries of science
C、has little to do with the working of their brains
D、is that left-handers are mainly twins