9 To ensure that the unmanned aircraft center of gravity (CG) limits are not exceeded, follow the aircraft loading instructions specified in the
B. Aeronautical Information Manual (AIM).
The Aeronautical Information Manual (AIM) is, as the subtitle says, the "Official Guide to Basic Flight Information and ATC Procedures". Every pilot of manned aircraft should have a copy and periodically review it's contents. From the AIM you can learn all about airport signs, taxiway and runway markings, ATC procedures, how to read weather reports and a lot more. But not anything about weight and balance. The FAA considers W&B so important that they have a separate publication: FAA-H-8083-1 (Weight and Balance Handbook).
This is not the correct answer.