Thanks for the question! When Y is selected, J can’t be selected. Why? Because when Y is selected, we know we can’t pick G from the contrapositive of rule one. And that means there are four fish left to pick from. That means we have to pick X, since if we don’t pick X, we’d only have two fish remaining, and we need three. So if we pick Y, we have to pick X. That means we don’t pick W, which means we don’t pick J based on rule 3. So (B) is wrong because it has J with Y.
Hope this helps! Feel free to ask any other questions that you might have.
