Answer:
A) writing source information on photocopies and Internet printout
Step-by-step explanation:
You should have a single place to track your sources. Being it source cards that are kept together or a notebook where you write it all down. If you write your information of random photocopies and printouts, you also have to keep track on them and you must create a way to always find what you're looking for. This would be much more work than putting all the sources in a single easier place.