I think that is A , but no sure
His ambition led to the destruction of his character.
Quentin is just plain dumb, there is nothing else inherently wrong with him.
C. Perfect competition
This is an unlikely scenario in which buyers and sellers all get to be perfectly informed as to all of the present options for quality, price, etc.
I think the correct answer would be the supreme court to declare laws unconstitutional, thereby striking them down. It is the responsibility or the duty of the judicial branch for them to determine a certain law is constitutional or not. Hope this helps.