Which of the following is a common breeding location for filth flies?

Garbage cans are a prevalent breeding location for filth flies because these areas provide the ideal environment for their larvae to thrive. Filth flies, such as houseflies and blowflies, are attracted to decaying organic matter, which is commonly found in waste and decomposing food waste located in garbage cans. The moist conditions and abundant food supply create a perfect habitat for the flies to lay their eggs, leading to rapid population growth.

In contrast, while flower beds, residential homes, and water sources may be associated with various pests, they do not offer the specific breeding conditions that filth flies require. Flower beds are generally cleaner and do not provide the decaying matter that filth flies prefer. Residential homes might offer waste but are not as consistently suitable as garbage cans specifically designated for waste disposal. Water sources can attract certain pests but are not typically favored breeding sites for filth flies, which seek out organic waste instead.