What causes fires to build on themselves and spread?
A) Fuel
B) Heat
C) Oxygen
D) Chain Reaction
Answer: D
Explanation: A) Incorrect. Chain reactions are what cause fires to build on themselves and spread.
B) Incorrect. Chain reactions are what cause fires to build on themselves and spread.
C) Incorrect. Chain reactions are what cause fires to build on themselves and spread.
D) Correct. Chain reactions are what cause fires to build on themselves and spread.
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