Answer:
C. The answers depend on people's opinions, not on observations.
Step-by-step explanation:
Morals are what people think is the right or wrong behavior and the goodness or badness of a character.
Ethics are morals that govern a person.
So the answer is C because these answers cannot be seen from the outside.
For example: A PERSONALITY TRAIT is something you can't really see. A PHYSICAL TRAIT is something you can see.
Ethics and morals are like personality traits.