What is the developmental time frame for most flies from egg to adult?

The developmental time frame for most flies, specifically common species like the housefly, from egg to adult typically spans about 7 to 14 days under optimal conditions. This timeframe includes the stages of egg, larva (or maggot), and pupa before reaching the adult fly stage. Environmental factors such as temperature and humidity can influence this duration, but generally, flies complete their life cycle within this period, making it an essential aspect of understanding their biology and an important factor in pest management.

The shorter time frames presented in other options would not accurately reflect the complete developmental cycle of most common fly species, while longer durations exceed typical development times and are not representative of average growth conditions.