Final answer:
Company sales reports are a form of secondary data. Company sales reports are data that have been collected and analyzed by the company itself, and can provide information about the sales performance and trends.
Step-by-step explanation:
In the context of research methods, secondary data refers to information that has been collected and analyzed by someone else, rather than the researcher themselves. Out of the given options, D) Company sales reports is a form of secondary data. Company sales reports are data that have been collected and analyzed by the company itself, and can provide information about the sales performance and trends. Secondary data can be useful for researchers as it saves time and resources, as well as providing additional insights.