Answer:
The correct option is d) By saying he wanted the soap, Chang is displaying the social norm of politeness.
Step-by-step explanation:
Every society has certain tradition and norms which it follows. There are some norms which are specific to a specific society whereas there are other norms which are followed by every society. Politeness is a virtue or a norm which is followed by every society in the world. If people wouldn't be polite to one another then interaction of social beings on earth would be extremely difficult.
In the above example, Chang also showed politeness by thanking for a gift which he did not want.