Marina Exam Reviewer: Of the listed vessels, which is to be regarded as a vessel "restricted in her ability to maneuver" in accordance with the Navigation Rules?

Marina Exam Reviewer 

Of the listed vessels, which is to be regarded as a vessel "restricted in her ability to maneuver" in accordance with the Navigation Rules? 

A. A vessel engaged in mineclearing 
B. A vessel fishing with trawls 
C. A vessel which has lost her rudder 
D. A vessel with a draft of such depth that she cannot change her course 


Answer:  A.  A vessel engaged in mineclearing