Which of the Following Does Sinnott-Armstrong Think Is a Counterexample

Multiple Choice

Which of the following does Sinnott-Armstrong think is a counterexample to the "public permission principle?"

A) It is permissible for consenting adults to have an "open marriage" in which they both agree that it is okay to sleep with other people.
B) It is permissible for people to speak loudly in a setting, such as an airport or a restaurant, in which other people are also speaking loudly.
C) It is permissible for people to do things even when they have never publicly been given permission to do those things.
D) It is permissible for individuals to emit unnecessary greenhouse gas emissions.