This appears to be a duplicate of question 100551 with a different claimed answer (D instead of B). Word document backgrounds are configured through Options menu settings. The background applies uniformly across the entire document and is set to a preset color choice. While users can choose from available colors (making D partially correct), this must be done through the Options configuration, not arbitrarily. The ambiguity between options B and D, plus the duplication with a different answer key, suggests a flawed question.