Friable particles from asbestos are dangerous to humans when:

While heating asbestos can release fibers into the air, it is the act of inhaling these fibers that poses the greatest danger. Heating alone does not directly cause harm; it is the subsequent inhalation of friable particles that leads to health issues. Therefore, this option does not accurately convey the primary risk.

Wet asbestos can reduce the likelihood of fibers becoming airborne, as moisture helps to bind the particles together. Although wet conditions can prevent inhalation, they do not eliminate the inherent dangers of asbestos exposure. Consequently, this choice does not represent the most critical aspect of asbestos-related health risks.

When asbestos is encapsulated, it is contained and poses minimal risk of exposure. Encapsulation is often used as a method of managing asbestos in buildings to prevent fibers from becoming airborne. Thus, this option inaccurately suggests a dangerous scenario when in fact it describes a safe condition.