Which statement is TRUE with respect to the load line markings shown in illustration D031DG below?

Correct Answer: Option C — A vessel displaying these marks may load in the salt waters of the St. Lawrence River.

Load line markings are governed by 46 CFR Part 42. The 'S' mark represents the Summer load line. Because the St. Lawrence River is considered salt water in the context of international load line conventions, a vessel may legally load to its summer salt water marks while in those waters.