contestada

Read the sentence from Patrick Henry's Speech to the Virginia Convention.
Why is this sentence an example of the use of metaphor?
I have but one lamp by which my feet are guided, and that
is the lamp of experience.
A. The word "lamp" is equated with the word "experience."
B. The word "experience is a detail that appeals to the senses.
C. The sentence compares two unlike things using "like" or "as."
D. The sentence ascribes human qualities to nonhuman objects.