choices.label: A B C D
choices.text: mouse:computer bowl:eat roller:ground engine:gasoline
explanation: "nails" can be nailed by "hammers". "mouse" is part of "computer". "bowl" is used for "eating", but "eat" cannot fill the "bowl". the "ground" can be pressed by the "roller". "gasoline" is the fuel for the "engine".
relation: hammer nail R3.10
relation: mouse computer R2.3
relation: roller ground R3.10
relation: engine gasoline R3.10