B through E all involve the random variables. L and N are not likely answer choices for a “must be true” question. That doesn’t mean you can eliminate them for certain without trying, but you should look elsewhere first.
A is CORRECT. It doesn’t have L or N. G has to go with F and K has to go with M. G and K lead to four variables. K, N, G, F – that’s too many to put in once spot.
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