Final answer:
The correct option is 1. A nylon cord is typically used for lacing the side flaps on the F-2B wing well container due to its strength, durability, and resistance to abrasion and chemicals.
Step-by-step explanation:
The type of cord used for lacing the side flaps on the F-2B wing well container is typically a nylon cord. This material is chosen due to its high strength and durability, which is essential for the secure attachment of the side flaps on the wing well container in an aircraft.
Nylon also has the benefit of being resistant to abrasion and resistant to chemicals, such as oils, which may be present in the aircraft environment.