Which of the Following Is False Regarding Wording in a Questionnaire

Which of the following is false regarding wording in a questionnaire?

A) Researchers should try to avoid difficult words that people may not understand.
B) When researchers inevitably use difficult words, it may be necessary to define those words.
C) Usually, researchers are advised to use abbreviations in questionnaires.
D) It is beneficial to avoid slang words in questionnaires