The data shown relates the number of thousands of reported whooping cough cases and the number of years passed since the discovery of the whooping cough vaccine. Which function models this scenario? Number of Cases 120 49 19 8 3
Number of Cases 0 5 10 15 20
A. y = 26 – 5.4 ln x
B. y = 5.4 – 26 ln x
C. y = –26 + 5.4 ln x
D. y = –5.4 + 26 ln x

It's A