Which of the following describes the set using set-builder notation?
A. x is a rational number
B. \{x | x is a rational number\}
C. \{\frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \frac{1}{5}, ...\}
D. x | x is a rational number
E. \{x | rational numbers\}
F. \{rational numbers\}
G. \{x is a rational number\}