What statement is true with respect to the back of a propeller blade?

Correct Answer: Option D — The back of the propeller blade is the side of the blade which faces upstream during ahead motion and is the side of the blade known as the suction side.

The back of a propeller blade is the forward-facing side, which experiences lower pressure as the blade moves through the water, creating the suction necessary for thrust. Conversely, the face is the aft-facing side, which exerts higher pressure against the water to drive the vessel forward.