When in command of a lifeboat under oars, the command "Backwater" means to _______________________.

A
lift oars to vertical position, trim blades fore and aft with handles resting on footings
B
complete the stroke, come to "Oars", raise oars smartly to vertical, rest handles on footing, trim blades fore and aft
C
row in astern motion
D
complete stroke, stop rowing, dip blade about halfway into water, hold water to stop the way on the boat
E