In terms of burglary prevention, what can make a home less appealing to burglars?

Visible security systems are a highly effective deterrent against burglary. When potential intruders observe security cameras, alarm systems, or even security signs prominently displayed on a property, they are likely to think twice before attempting a break-in. The visible presence of these security measures signals to burglars that the risk of being caught is high, thereby making the opportunity less appealing.

While limited access to the backyard can contribute to security, it is not as definitive as the psychological impact of a visible security system. Similarly, subdued colors on a home's exterior might affect aesthetics but do not play a direct role in deterring crime. The presence of pets can act as a deterrent as well, but the primary reason they are effective is due to noise or their potential to alert homeowners rather than the overt warning provided by visible security systems. Overall, the best prevention measure from the given choices is the clear presence of security features that create a barrier of risk for would-be criminals.