Suppose that you're choosing a hypothetical board where A, B, and C MUST be in the group. But D floats, and need not be in the group. Since we're asking for what COULD be a complete and accurate list, would answer choice {A, B, C} suffice? Or need we include floater D, who does not out of necessity need to be in the set ?
Comments
I think ABC definitely works, as long as you're not leaving out something that must be true or including something that must be false the answer should be correct