According to Sinnott-Armstrong, If We Cannot Find Any Moral Principle

According to Sinnott-Armstrong, if we cannot find any moral principle to back up our intuition that wasteful driving (of the sort mentioned in his article) is wrong, then

A) we know that wasteful driving is morally permissible.
B) we know that particularism is true.
C) we do not know whether wasteful driving is wrong.
D) we know that wasteful driving is not wrong.