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Spraying water on rubble before cleaning it up inside a building is advisable primarily to prevent dust clouds. When rubble or debris is disturbed, it can create a significant amount of dust, which poses health risks to workers and can reduce air quality within the premises. By dampening the materials with water, you can minimize the dust that is released into the air during the cleanup process. This measure helps ensure a safer and healthier working environment for everyone present, reducing respiratory issues and maintaining better visibility due to the lack of airborne particles.

Other reasons provided in the options, such as fire hazards, pest elimination, and visibility improvement, are not the main concern when dealing with rubble cleanup. While controlling dust directly impacts visibility and can prevent other issues indirectly related to air quality, the primary focus remains on dust suppression to maintain a safe work environment.