Question

The human brain comprises three main parts—the cerebral cortex, the cerebellum, and the brainstem. The brainstem is positioned at the top of the spinal column, just below the cerebellum. It is the crossroads of the brain. Every impulse generated in the cerebral cortex or cerebellum to the rest of the body must go through the brainstem on its way to that muscle or organ or nerve cell. By the same token, any nerve impulse generated in the body below the head must travel through the brainstem to get to the cortex or cerebellum for processing.
2
Which of these choices is a metaphor?
A.
The brainstem is just below the cerebellum.
B.
Nerve impulses generated in the body.
C.
It is positioned at the top of the spinal cord.
D.
The brainstem is the crossroads of the brain.

Answer 1

D. "The brainstem is the crossroads of the brain."
- This compares the brainstem to a crossroads (a place where routes meet) figuratively; it's not a literal crossroads.