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 fully loaded survival craft?

Why C is correct

46 CFR §199.150(e) requires each launching appliance's structural attachment to the vessel to be designed, based on the 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.