Final answer:
To find the meaning of 'underbrush' in a sentence, look for context clues that provide a definition, such as a descriptive phrase that explains what it is. In this case, the sentence provides a definition by directly explaining that underbrush consists of thick shrubs and small trees on the forest floor.
Step-by-step explanation:
When trying to determine the definition of underbrush based on the context clues in the third sentence, we should look for specific hints in the surrounding text that can point us to the correct definition. Context clues are hints that an author gives to help define a difficult or unusual word.
These clues can come in the form of synonyms, antonyms, definitions, and examples. If we see a sentence like 'We had to clear the underbrush, the thick shrubs and small trees that fill the forest floor, in order to walk through the woods,' the context clues in this sentence are in the form of a definition.
Here, 'the thick shrubs and small trees that fill the forest floor' is the part of the sentence that defines what underbrush is, so the correct answer to the question would be C) Definition.