Which situation could be modeled by the function y = 400(1 – 0.17)x? Here are the possible answers, can someone please help me?

A) The population, y, of a city after x years that grows at a rate of 17% every 3 years
B) The amount of medicine in milligrams, y, in a human body that starts with 400 milligrams and
decreases by 17% every hour, x
C) The money, y, in an account that starts with $400 and increases by 17% every year, x
D) The height of a tree, in inches, y, that starts at 400 inches and grows by 17 inches every year, x