Final answer:
The items a pilot-in-command must not be informed of their location include hair curlers containing hydrocarbon gas, non-flammable gas cylinder, and wheelchair with spillable batteries, according to aviation regulations.
Step-by-step explanation:
The subject matter of this question pertains to the items that a pilot-in-command must not be informed of their location on an aircraft. According to safety regulations and guidelines, there are certain hazardous materials that, when transported, do not require the pilot's awareness. The correct answer to the student's question is: a. Hair curlers containing hydrocarbon gas, non-flammable gas cylinder, and wheelchair with spillable batteries. These items are considered dangerous goods, and specific regulations dictate how they should be handled; however, it is not required for the location of these items to be known by the pilot-in-command. Such measures ensure that the pilot focuses on the safe operation of the aircraft without being burdened by the specific details of cargo placement unless necessary for flight safety considerations.
When working with potentially hazardous items such as flammable chemicals, it is crucial to follow safety regulations and instructions carefully. For example, in a laboratory setting, this would mean working in a well-ventilated space, securely fastening loose clothing, tying back long hair, and following the teacher's instructions with regard to handling chemicals and operating a Bunsen burner.