How does the author introduces the idea that there advantages to using cell phones

How can behavioral science be applied in improving public health? a.by tracking a disease to determine its sourceb.by creating promotions that improve health habitscboth by tracking a disease to determine its source and by creating promotions that improve health habitsd.neither by tracking a disease to determine its source or by creating promotions that improve health habits

Name two events that gatsby tells nick about that nick finds suspect . what proof does gatsby offer ?

According to the police officer, the car accident could not have been avoided.