In a drama what is the actors main responsibility?

Which phrase best describes roosevelt’s explanation of the german japanese war

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

What does the line most likely show about the setting of the scene?