What does basic weight include on an aircraft?

Basic weight is defined as the weight of an aircraft along with all its necessary non-disposable items. This includes the airframe, the engines, the installed equipment (like avionics and systems), fluids necessary for operation (except for usable fuel), and the crew's equipment, but does not include disposable items such as fuel, cargo, or passengers.

In this context, the correct choice accurately reflects that basic weight encompasses all significant components of the aircraft that will remain after it is prepared for flight, except for items that are consumed or removed during operation, like fuel and payload. Understanding this distinction is critical in aviation for calculating the aircraft's total weight and performance metrics.