When trying to sight a lighthouse you notice a glare from a town in the background. The range at which the light may be sighted due to this glare is __________.

Correct Answer: Option A — considerably reduced

Background lighting, or 'light pollution' from shore-side towns, significantly reduces the effective range of a navigation light. This phenomenon, known as glare, decreases the contrast between the signal light and its surroundings, making it difficult for the observer to distinguish the light until much closer distances.