Replacing A with ‘coffee’ and B with ‘tea’ may be useful, here. It seems reasonable to me to not know offhand whether you prefer coffee or tea—I suspect most people have never thought about that directly—but most people would still know that they’d prefer (for example) an espresso from Starbucks (A1) to a cup of Earl Grey (B1), and either of those to a cup of coffee from the local diner where the coffee always tastes like soap (A2).
Replacing A with ‘coffee’ and B with ‘tea’ may be useful, here. It seems reasonable to me to not know offhand whether you prefer coffee or tea—I suspect most people have never thought about that directly—but most people would still know that they’d prefer (for example) an espresso from Starbucks (A1) to a cup of Earl Grey (B1), and either of those to a cup of coffee from the local diner where the coffee always tastes like soap (A2).