Which statement about the quadratic parent function is true? a)its graph is symmetrical about the x-axis. b)its graph is symmetrical about the y-axis. c)its domain is the set of all non-negative numbers. d)its range is the set of all real numbers.

The correct answer is Choice B: It's graph is symmetrical about the y-axis.

A quadratic equation is in the shape of the letter U. Therefore, you could draw a vertical line and the shape would be split into two congruent parts. Therefore, it is symmetrical. The y-axis is a vertical line.