A group of students were followed over time to determine their quality of college life. The Quality of Life Index was used to rate the student's perceptions on a scale of 1 - 7 (with '1' representing poor quality of college life, and '7' representing an excellent quality of college life). The instrument was given to the study group at the beginning of each year until they graduated. Which test would be best to analyze these data?

A. Kruskal-Wallis test

B. Phi coefficient

C. Friedman Test

D. Spearman Rho rank order correlation

E. Repeated measure ANOVA