Which of these describe a scenario in which the given quantity changes at a constant rate with respect to time? Select all that apply.
A. A town's population increases by 218 people every 2 years.
B. There are 1,240 people exiting a football stadium every 10 minutes.
C. A country's population increases by 1.65% each month.
D. The number of registered voters in a county decreases by 0.25% each year.