The correct answer is B. Pollution . Commercial property broad forms generally insure many direct physical loss or damage exposures, but they also contain important exclusions. Pollution is commonly excluded or heavily restricted because pollution losses can be gradual, widespread, difficult to measure, expensive to remediate, and subject to environmental regulation. Pollution may involve contamination by chemicals, smoke, vapours, fuel, waste, hazardous substances, or other pollutants. Standard property policies usually do not intend to cover broad environmental cleanup liability or contamination losses unless a specific exception, extension, or environmental policy applies. Riot is commonly an insured peril under broad commercial property forms. Leakage from fire suppression systems is typically treated as a covered water-related peril unless excluded by specific circumstances. Explosion of natural or manufactured gas is also commonly insured as an explosion peril. The key distinction is that pollution is not treated like an ordinary sudden property peril under many standard forms. Brokers must identify pollution exposure separately and recommend appropriate environmental impairment or pollution liability coverage where needed. Course topic reference: Property Coverages; Commercial Property Broad Form; Exclusions; Pollution; Environmental Exposures .