Which of the Following Is NOT Discussed in Chapter 6

Which of the following is NOT discussed in Chapter 6 as a way of responding to counterexamples?

A) "Biting the bullet" and accepting the counterexample's counterintuitive result.
B) Insisting that the scenario is not actually a counterexample to the scenario being described.
C) Revising the principle so that it gets the right answer in the scenario described in the counterexample.
D) Adopting whatever normative theory is needed to show that the counterexample does not undermine one's argument.