Read the passage.

Which statement best expresses the main idea of this passage?
A
Thousands of brain scans have been fed into the Reality Monster supercomputer.
B
Someday, surgeons hope to transplant a human brain in the same way that hearts are transplanted.
C
A scientist has designed a program that takes data about a brain and turns it into a 3-D image.
D
The brain is the most important, but also the