which two quantitative variables would show that a straight line will be produced on a scatterplot

A. time it takes to get to the grocery store and the number of grocery items purchased
B. time spent time spent mowing the lawn and the number snakes in the yard
C. time spent studying for an exam and the grade on the exam
D. time spent playing video games and adult shoe size

C. time spent studying for an exam and the grade on the exam