Certain trees in fact produce seeds only when fire heats them if the fire removes thick shrubs and undergrowth the water supply increases aiding other plants and local animals fire also may kill predatory insects or pest that live on and damage otherwise healthy trees
Which set of context clues best points to the correction definition of undergrowth in the second sentence
A. Seeds , fire , animals
B. Water, plants, animals
C. Insects, pests, fire
D. Thick shrubs, plants, trees