The number that can be engraved in places on your boat, other boat parts, and accessories and that can help you identify them more easily to police in case of theft is:
Driver's License Number.
Let's understand what Driver's License Number is all about.
<h3>Driver's License Number</h3>
Driver's License Number is known to be an identification number that is specifically assigned to a driver by an issuing government agency.
It's a form of unique identifier that is used for record keeping as well.
When such number is engraved on boats and other hidden parts, it helps police to track the vessels down when stolen.
The answer is most likely D. Refused aid to any nation at war. If the U.S. remained neutral, it would not have to worry about going to war/being attacked by a nation at war with another. Hope this helps! Brainliest is always appreciated!