C. If the owner does not have a valid United States driver's license.
31 According to 14 CFR part 48, when would a small UA owner not be permitted to register it?
This is not the correct answer.
Positive ID is not required for registering your aircraft, and the minimum age for registration is 13, so the younger applicants won't have a driver's license..
Photo Credit, David Niblack, Imagebase.net