DrGeorge Examines the Relationship Between Students' Distance to School and the Amount

Dr.George examines the relationship between students' distance to school and the amount of time they spend studying.If no relationship between the variables exists,then

A) as distance to school increases,time spent studying increases.
B) as distance to school increases,time spent studying decreases.
C) distance has no effect on time spent studying.
D) as distance to school increases,time spent studying first increases and then decreases.