What causes damage to property related to leaking points, trapped piping, and water hammer in a water system?

The correct choice identifies poor workmanship as a primary cause of damage related to leaking points, trapped piping, and water hammer in a water system. When a system is poorly constructed, it may lack the necessary seals or proper joint alignments that prevent leaks. Deficient installation practices can also lead to areas where pressure builds up excessively, creating water hammer conditions—these sudden pressure surges can damage pipes and fittings over time.

Additionally, if the workmanship doesn't ensure that piping is properly sloped or secured, it may lead to trapped water, which increases the risk of leakage and subsequent property damage. These issues often arise from a lack of attention to detail during installation or a failure to adhere to established plumbing codes and standards.

While other factors like lack of maintenance, inferior materials, and excessive pressure can contribute to problems within a water system, poor workmanship is fundamentally about the initial setup and how well the system was assembled, which directly correlates to the types of damages mentioned.