PT66.S2.Q20 - daniel: there are certain actions

Luluc1234

http://7sage.com/lsat_explanations/lsat-66-section-2-question-20/

Not having problem with solving this question but having problem with how to diagram a specific sentence.

Carrie: "the only thing that can be required for an action to be morally good is that it fulfill a moral obligation."

J.Y diagrammed this as bi-conditional. I am having a hard time to see it. Although it does have both sufficient and necessary indicators ("the only" and "required"), I just don't see how Fulfill Moral Obligation(FMO) can be sufficient for Morally Good. Intuitively, saying FMO is the only requirement does not seem to indicate that it is sufficient. Technically, I couldn't break this sentence into two sentence (one using the sufficient indicator and another using the necessary indicator) like J.Y has done for the other bi-conditionals.

Any thoughts?

nye8870

The only necessary requirement that a morally good action has, is that the action fulfill a moral obligation. So my thought was : If an action is MG ----> the action definitely FFMO. I don't see the bi-conditionality either.