In a Lecture on Sleep,Professor Kaurala Is Using a Metaphor

Multiple Choice

In a lecture on sleep,Professor Kaurala is using a metaphor to explain the cycles between NON-REM and REM.Which of the following is most appropriate in describing the journey through the night?

A) someone hiking in the mountains going up and down hills and valleys
B) a caterpillar turning into a butterfly and then dying
C) an acorn growing to be an oak tree
D) a submarine diving to very deep depths