Which of the following conditions can lead to mold growth?

Mold growth is primarily fueled by moisture, making high moisture levels a critical condition that leads to its proliferation. Mold spores are ubiquitous in the environment, and when they land on surfaces with adequate moisture, along with organic material to feed on, they can grow rapidly. High moisture levels can result from various sources, including leaks, flooding, high humidity, and condensation. These conditions create an ideal environment for mold to thrive, often requiring remediation to eliminate the growth and restore healthy conditions.

In contrast, dry indoor air generally inhibits mold growth because moisture is a necessary component for mold to flourish. Moderate ventilation may help reduce humidity levels and thus lower the risk of mold, while regular sunlight can also deter mold growth as ultraviolet light has antimicrobial properties and can dry out damp areas. Thus, high moisture levels are the definitive condition that leads to mold growth, making it the correct choice in this context.