Final answer:
A scatter plot is the most ideal graph and chart type to visualize the relationship between a pair of continuous variables(option 3).
Step-by-step explanation:
The most ideal graph and chart type to visualize the relationship between a pair of continuous variables is a 3) scatter plot.
A scatter plot is used to represent the relationship between two variables by plotting individual data points on a Cartesian coordinate plane. Each data point represents a pair of values, one for each variable. The position of the data point on the coordinate plane shows the relationship between the variables.
For example, if you are studying the relationship between the amount of study time and test scores, you can use a scatter plot to plot each student's study time on the x-axis and their corresponding test score on the y-axis. The scatter plot will show if there is a positive, negative, or no relationship between the variables.