Suppose That Students Who Work Fewer Hours at Their Jobs

Multiple Choice

Suppose that students who work fewer hours at their jobs tend to have higher grade point averages and they also tend to get more sleep.What would the correlation coefficient be if we were to correlate the two variables of grade point average and number of hours of sleep

A)  greater than 1, but less than 2 
B)  equal to 0 
C)  less than zero, but greater than -1 
D)  greater than 0, but less than 1