Final answer:
Reports and records of prior investigations are the most reliable resource while conducting a scientific investigation.
Step-by-step explanation:
The most reliable resource while conducting a scientific investigation would be A, reports and records of prior investigations. These reports and records provide valuable information about previous research, methodologies used, and results obtained. This allows scientists to build on existing knowledge and make informed decisions in their own investigations.
On the other hand, books written about scientific research and prior investigations (B), scientific journals (C), and news, nature, and travel magazines (D) can be useful sources of information, but they may not always be as reliable as reports and records of prior investigations.