Final answer:
A line graph would be the most appropriate data display to represent the given data.
Step-by-step explanation:
The data given represents the years since 2010 and the average price of a gallon of milk at those times.
To represent this data, a line graph would be the most appropriate data display.
A line graph shows the relationship between the years since 2010 and the average price of a gallon of milk.
The x-axis would represent the years since 2010, and the y-axis would represent the average price in dollars.