Thoreau included the following sentence in Walden:
"There is some of the same fitness in a man's building his own house that there is in a bird's building its own nest."
Which of the following statements rephrases his literal comparison as a metaphor?
A. A man building his house is like a bird building his nest
B. A man's house is his nest
C. Every bird is an architect and a builder of a nest
D. Between a hman house and an avian nest, there is absolutely no difference.