The average price for different brands of toothpaste could be visually displayed in a(n)

A) normal curve.
B) extrapolation.
C) standard deviation.
D) bar graph.

The best choice for visually displaying the average price for different brands of toothpaste would be a bar graph, as it allows for easy comparison of prices between different brands. A normal curve would not be appropriate as it is typically used for displaying data that follows a particular distribution. Extrapolation and standard deviation are statistical concepts and not methods of visual display.