Final answer:
The provided statement about NDB accuracy is not absolutely correct without considering different factors that can impact its performance. Typically, the accuracy is better than 10 degrees under ideal conditions, but it can vary.
Step-by-step explanation:
The accuracy of an Non-Directional Beacon (NDB) is not as simple as stating it is accurate to 10 degrees. An NDB's accuracy can be affected by various factors such as atmospheric conditions, terrain, and technical characteristics of the reception equipment. The statement 'An NDB is accurate to 10 degrees' cannot be deemed wholly true or false without context. However, generally speaking, the accuracy of an NDB can be much better than 10 degrees under ideal conditions, but it can also be worse due to the mentioned factors. Therefore, the absoluteness of the given statement is incorrect, and the most appropriate answer would be 'B. False' if referring to it as a constant value.