Final answer:
The development of a fire in the incipient stage depends largely on heat, fuel, and oxygen.
Step-by-step explanation:
The development of a fire in the incipient stage depends largely on three factors: heat, fuel, and oxygen. Heat is responsible for the initial ignition of the fire and helps maintain it.
Fuel, which can be any combustible material, provides the substance for the fire to burn. Oxygen supports the chemical processes that occur during the fire. When these three elements are present, a fire can start and spread.