The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

• A. <img src="/_files/images/mechanical-engineering/hydraulic-machines/192-14-1.png">
• B. <img src="/_files/images/mechanical-engineering/hydraulic-machines/192-14-2.png">
• C. <img src="/_files/images/mechanical-engineering/hydraulic-machines/192-14-3.png">
• D. <img src="/_files/images/mechanical-engineering/hydraulic-machines/192-14-4.png">