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Alex made the ruler shown.
The unit of the ruler, n, is a rational number.
The variable x describes an irrational length.
Which of the following can describe the length 4x?
A. 4x must be irrational, because a nonzero, rational number times an irrational number is always irrational.
B. 4x can be either rational or irrational, because x is not located on a tick mark on the ruler.
C. 4x can be either rational or irrational, because each tick mark on the ruler is a fraction of n.
D. 4x must be rational, because a nonzero, rational number times an irrational number is always rational.
