A group of researchers wants to know if paper color has an impact on exam performance. A sample of 60 college students is randomly assigned to take a basic mathematics exam on either white paper, blue paper, or pink paper. Exam scores are recorded for each student and compared across the paper colors. Which one of the following statements about this study is correct? Group of answer choices : The individuals in this study are the college students. The response variable is the paper color. We would consider this study to be an observational study. The explanatory variable is the exam score. There are two treatments in this study