Jet propulsion: identify the correct thrust mechanism. Choose the statement that correctly describes how thrust is produced in jet propulsion systems.

Concept/Approach
Jet propulsion (including turbojets and rockets) produces thrust by high-velocity ejection of propellant/exhaust gases from within the vehicle, generating a reaction force according to momentum conservation.

Option check
A Correct for jets/rockets.
B Describes propellers, not jets.
C Not generally true for air-breathing jets (requires air); it is true only for rockets.

Final Answer
The propulsive matter is ejected from within the propelled body.