The correct answer is option 3, Arson. Arson is a socially induced man-made disaster as it involves the intentional act of setting fire to property or land. It is typically motivated by criminal intent such as revenge, insurance fraud, or vandalism. Arson can have severe consequences, including loss of life, destruction of property, and displacement of individuals and communities.

Option 1, Debris Avalanche, is a natural disaster caused by a rapid downhill movement of rocks, soil, and other debris. Option 2, Saltwater Intrusion, refers to the contamination of freshwater resources by the intrusion of saline or saltwater. Option 4, Ozone depletion, is caused by the release of harmful chemicals into the atmosphere, mainly chlorofluorocarbons (CFCs), which leads to the thinning of the Earth`s ozone layer.