D. a pie graph
A pie graph is the best choice because it can show the number of people in the class who are visual learners, auditory learners, and kinesthetic learners. Each piece of the pie would be the correct size percentage in relation to the whole. This is also why the pie graph would be a good choice. It not only compares the numbers of each group to each other, but also shows the data in comparison to the whole. A map is just a bad idea. A line graph also is not effective because you're not tracking the growth of something. A bar graph is the second best answer because it will demonstrate the difference in numbers. The only problem is that it doesn't do a good job showing how the numbers compare to the class as a whole: what percentage of each learner type is in the class.
