question: language:thought
choices.label: A B C D
choices.text: behavior:character head:brain chalk:blackboard paper:knowledge
explanation: "language" can embody "thought". "behavior" can reflect "character". the "brain" is part of the "head". "chalk" is used in conjunction with "blackboard", and "chalk" is not reflected through "blackboard". "knowledge" can be expressed through words, not through "paper".
relation: thought language R3.10
relation: character behavior R3.10
relation: brain head R2.2
relation: chalk blackboard R3.10