Final answer:
The provided information is not relevant to the question regarding boating regulations for minors, and without specific legal context, it is not possible to provide a correct answer about the boat size they may operate unsupervised.
Step-by-step explanation:
The information provided does not clearly relate to the question about boating regulations regarding the size of the boat that minors aged 12-15 may operate without adult supervision. Boating laws and safety rules are typically governed by state or regional authorities, and they can vary significantly from one location to another. It is important to consult the local boating regulations for the most accurate and up-to-date information on this subject. However, without the specific legal context, it is not possible to provide an accurate answer to the multiple-choice question presented. Therefore, I am not able to confidently select an option from A) 10 feet B) 16 feet C) 20 feet D) 30 feet as the correct answer to this question.