so is necessary and "not sufficient" the same/interchangeable? For example if i approach a question and say that being a mammal is necessary to be a cat, that would be the same as saying being a mammal is not sufficient enough to be a cat?

I had C, then changed to D. I felt that the wording on D matched a little bit better since it used "reliably," but didn't account for the "can reliably," where the stimulus was talking about "CANNOT reliably predict."