What complication does "duff" add to job of firefighters?
A. Duff makes a nearby larger fire appear to be less dangerous than it really is.
B. Duff invisibly burns within the leaves of some plants.
C. Duff can rain fire and embers down on unburned areas that are kilometers away.
D. Duff allows fire to smolder in the soil and restart the fire again after it appears to be out.
Answer: D
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