Which situation does NOT show causation?
F. When the number of minutes a person exercises increases, the number of calories burned increases.
G. When the number of hours a student studies for an exam increases, the number of students taking the exam increases
H. When an hourly worker decreases the total number of hours worked, the worker's income decreases.
J. When there are more homework problems assigned to a student, the amount of time spent to complete the homework increases.