Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines - Discussion

Option B is correct because the jet propulsion matter flows around the jet body.

Rocket propulsion is ejected the propulsion and rocket fly forward.

Jet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction. By Newton's third law, the moving body is propelled in the opposite direction to the jet. Reaction engines operating on the principle of jet propulsion include the jet engine used for aircraft propulsion, the pump-jet used for marine propulsion, and the rocket engine and plasma thruster used for spacecraft propulsion. Biological systems include the propulsion mechanisms of certain marine animals such as cephalopods, sea hares, arthropods, and fish.

So, B is correct.