The following statements represent different approaches to using sources. Choose the one that best describes how students should use sources when writing papers. O a. The wisdom of the ancients should be committed to memory, and the best answer to some questions is to quote traditional sayings with no need to mention the source. O b. Background on a topic can be distilled from many different sources and presented as a summary without specific quotations or precise references. c. A paper may include primarily factual claims, with little interpretation, if all of the facts are backed up with specific citations. O d. Arguments should include a blend of previous knowledge, new facts that are backed up with evidence, and the writer's own conclusions that come from interpreting the evidence.