An instructor finds the more often students ask for help in office hour visits, the greater the improvement in their performance across the semester. Which of the following correlations BEST reflects this relationship between asking for help and course performance?

A) r = -1.00
B) r = .05
C) r = -.50
D) r = .45

A positive correlation is needed to reflect that more office hour visits are associated with higher course performance. The correlation coefficient should also be of moderate strength to indicate a significant relationship, but not perfect (r = -1.00). Therefore, option D (r = .45) is the best choice, as it reflects a moderate positive correlation between asking for help in office hours and the improvement in course performance.