Under 46 CFR Part 199, the structural attachment of a launching appliance to the vessel must be designed so that its ultimate strength is at least how many times the load imparted under the most adverse combination of list and trim with the survival craft fully loaded?

Why D is correct

46 CFR §199.150(e) specifies that each launching appliance's structural attachment must be designed, based on ultimate strength of the construction material, to be at least 4.5 times the load imparted by the launching appliance and its fully loaded survival craft under the most adverse combination of list and trim. The other multipliers do not appear in this context in the source regulations.