Aircraft propellers: identify the correct propulsion description. Choose the statement that correctly describes how propellers produce thrust for aircraft flight.

Concept/Approach
An aircraft propeller accelerates surrounding ambient air (the propulsive matter) rearward, generating thrust by changing the momentum of the air around the aircraft. This depends on the presence of air.

Option check
A describes jet/rocket propulsion, not a propeller.
B is correct for propellers: they act on the external air stream.
C is false: propellers require air.

Final Answer
The propulsive matter is caused to flow around the propelled body.