The term "ladder fuels" refers to ________.
A. an evolutionary hierarchy of flammable plants, from primitive ferns to complex flowering trees
B. a hierarchy of carbon-rich flammable materials, from wood to peat, coal, and petroleum products
C. extinguishing materials used by urban firefighters
D. vegetation of varying heights, which allow fire to quickly climb upward
E. fuel made of old woodworking scraps and workbenches
Answer: D
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