Which situations are best modeled by an exponential relationship? Select all that apply. A: A tree frog population in a national forest doubles every three weeks.

B: Every year, attendance at an amusement park increases in spring and decreases in autumn.

C: The total amount of emails if every person that receives an email forwards the email to five friends.

D: A district-wide basketball tournament eliminates 50% of the participant teams after each game.

E: A ball is thrown straight up from shoulder height with a velocity of 14 m/s and then falls to the ground.

F: A savings account earns 7.5% interest every month for the first 12 months, and then no longer earns interest.