In stopping distances of vessels, "head reach" can best be described as the __________.

A
difference between the vessel's speed through the water at any instant and the new speed ordered on the telegraph
B
distance the vessel has actually run through the water since a change of speed was ordered
C
distance the vessel will run between taking action to stop her and being stationary in the water
D
speed at which a vessel should proceed to ensure that she will run a predetermined distance, once her engines have been stopped
E