Suppose you have 2 friends, one is tall, about 6 feet tall and has a GPA of 3.80. Also your other friend who is also tall has a GPA of 4.0. This make you wonder if a person's height has any association with their GPA. You decide to conduct a study and collect data on the topic. Which of the following is the best graphical representation for this problem.

a. Scatterplot. I will label height as my explanatory variable and GPA as the response.

b. Line graph. I will record the time it takes for them to record GPA.

c. Scatterplot. I will record height as my response and GPA as my explanatory variable.

d. Pie chart. These variables are categorical.