Are the words in bold letters used correctly? Parts for American made cars are easier to get than parts for foreign made cars,

Me with english (easy for you) 50 points

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

Which lines in this excerpt from act b of shakespeare macbeth tell the audience that macbeth realizes his mistake and regrets his ambition