Concept:Logicians study how statements can be true or false. Informative language is their main tool because it carries factual content that can be verified.Explanation:Logicians examine whether arguments are valid and whether statements are true. Informative language presents facts and data, which allows such logical checking. Emotive language appeals to feelings and is not verifiable. Poetic language uses metaphors and imagery, which are not meant to be literal. Directive language gives commands and cannot be judged as true or false. Only informative language gives assertions that logicians can test for truth and validity.Answer:C. Informative language