The noise limiter should be ________________________ as necessary to reduce ______________________ noise (static) while receiving.

The choice of adjusting the noise limiter to reduce extraneous noise while receiving signals is correct because extraneous noise refers to unwanted ambient sounds and interference that can disrupt the clarity of received communications.

In radio operations, especially for a boat crew, minimizing any unrelated noise is essential for clear communication, particularly in environments where background noise levels can be high, such as when at sea. Adjusting the noise limiter serves to enhance the quality of the received signal by filtering out any noise that does not pertain to the communication at hand, ensuring that key messages can be understood without interference.

The other options, while touching upon noise management, do not accurately convey the specific focus on extraneous sounds that can lead to miscommunication. Therefore, emphasizing the adjustment of the noise limiter to eliminate extraneous noise is crucial for effective and reliable communication in a maritime setting.