@joao123 It's always both. Few mean "some are," and "most are not."

@Hfa Because both necessary conditions have to be met for the sufficient condition. The way they are independent is this: If the sufficient condition is met we can say, one (or both) of the necessary conditions are met. So, If an action is morally good, we can safely say it benefits others, without necessarily saying that it was performed with that intention. However, it certainly was.

@AliMerhi Yes, not because O is not adopted but because we don't need O to be adopted to safely claim that N is adopted. The sufficient conditions "M is adopted" is enough.