During counterflooding to correct a severe list aggravated by an off-center load, your vessel suddenly takes a list to the opposite side. You should __________.

Correct Answer: Option D — immediately stop counterflooding

A sudden shift to the opposite side during counterflooding indicates the vessel has passed through the upright position and the corrective moment has overcompensated. Immediate cessation of counterflooding is vital to prevent compounding the list and inducing a catastrophic capsizing moment.