Which of the following is a sign of a pest infestation in a home?

Unusual noises or scratching is indeed a key indicator of a pest infestation in a home. Many pests, such as rodents and insects, can create distinct sounds that are often noticeable, particularly at night when the house is quieter. For example, mice and rats may scurry within walls or ceilings, and their scratching can often be heard, indicating their presence. This auditory clue can help homeowners or pest management professionals identify and address a pest issue before it escalates.

On the other hand, excessive sunlight does not correlate with any signs of pests; rather, it can affect the home environment in different ways but is not an indicator of infestation. The presence of new furniture may simply pertain to changes within the home and does not indicate pest activity. Improved air quality is also unrelated to pest presence, as it can result from various factors such as better ventilation or air filtration rather than being linked to infestations.