A launching appliance's structural attachment to the vessel must be designed so that its ultimate strength is at least how many times the load imparted by the appliance and its fully loaded survival craft under the most adverse combination of list and trim?

Why A is correct

46 CFR §199.150(e) requires that each launching appliance's structural attachment to the vessel be designed, based on the ultimate strength of the construction material, to be at least 4.5 times the load imparted on the attachment by the launching appliance and its fully loaded survival craft under the most adverse combination of list and trim specified in §199.150(c).