choices.label: A B C D
choices.text: ink:brush moonlight:sky sailboat:sea wings:butterfly
explanation: the "engine" is part of the "car". "ink" and "brush" are a set. "moonlight" is the light of the moon, which is reflected from the sun's light on the moon. there is no obvious logical relationship between "moonlight" and "sky". "sailboats" are not part of "the sea". "wings" is a component of "butterflies", and "butterflies" contains "wings".
relation: engine car R2.3
relation: ink brush R3.10
relation: sailboat sea R3.10
relation: wings butterfly R2.3