Answer :
Final answer:
All boats less than 39.4 feet in length must carry a whistle as a means of communication with other boats.
Explanation:
In boating, all boats less than 39.4 feet in length are legally required to carry a whistle as a means of communication with other boats. This is because whistles have been designated as a standard sound signal for boats. They help boaters to transmit important messages and warnings to other vessels, especially in situations where verbal communication may not be possible.
The warning signals mentioned in the reference—alert-steady whistle or siren, and take cover-wailing siren or short whistle blasts—are examples of different sound signals that boaters use to communicate different messages.
For instance, an alert-steady whistle or siren indicates a warning, while a take cover-wailing siren or short whistle blasts signal the need to seek shelter.
Therefore, the correct answer to the question is C) Whistle.