Which situations described can be modeled by an exponential function?

(This is on USATestPrep btw.) And I can choose more than 1 answer

A. car rental for $38 plus $0.40 mile driven

B. bacteria colony of 5,000 triples every 60 minutes

C. city with a population of 20,000 doubles every 8 years.

D. 1,000 grams of radioactive material with a half-life of 6 hours

E. amusement park membership that costs $40 and then just $5 per visit​

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0