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Multiple Choice

In modes of aerial delivery, rotary-wing operations are helicopters; fixed-wing operations are planes.

The main idea is how lift is produced and what that defines. Rotary-wing aircraft generate lift with rotating blades (rotors) and are known as helicopters. Fixed-wing aircraft generate lift with stationary wings and need forward airspeed to create lift, which defines planes. So, the statement that maps rotary-wing operations to helicopters and fixed-wing operations to planes is the correct one. It reflects the standard classification used in aerial delivery and aviation more broadly. The other options don’t fit because they swap roles, imply an irrelevant category (submarines), or incorrectly describe fixed-wing lift mechanisms (fixed-wing aircraft don’t rely on rotors for lift—rotors are the hallmark of rotorcraft, not fixed-wing airplanes).

The main idea is how lift is produced and what that defines. Rotary-wing aircraft generate lift with rotating blades (rotors) and are known as helicopters. Fixed-wing aircraft generate lift with stationary wings and need forward airspeed to create lift, which defines planes.

So, the statement that maps rotary-wing operations to helicopters and fixed-wing operations to planes is the correct one. It reflects the standard classification used in aerial delivery and aviation more broadly.

The other options don’t fit because they swap roles, imply an irrelevant category (submarines), or incorrectly describe fixed-wing lift mechanisms (fixed-wing aircraft don’t rely on rotors for lift—rotors are the hallmark of rotorcraft, not fixed-wing airplanes).