The TPI curve, one of the hydrostatic curves in a vessel's plans, gives the number of tons __________.

Correct Answer: Option A — necessary to further immerse the vessel 1 inch at a given draft

Tons Per Inch (TPI) immersion defines the weight required to sink a floating vessel uniformly by one vertical inch in salt water, serving as a primary hydrostatic property utilized by deck officers for rapid cargo loading and draft change estimations.