Final answer:
A line graph would be the most suitable visual aid to compare average temperatures between two Sunbelt states over a year.
Step-by-step explanation:
If you are writing a report comparing average temperatures over the course of one year between two Sunbelt states, the most suitable visual aid would be a line graph. A line graph can effectively show the trend and fluctuations in temperatures over time. It can also allow for easy comparison between the two states.
Learn more about Visual aids for comparing data