Which of the Following Is a Reason for Caution in Using

Multiple Choice

Which of the following is a reason for caution in using brain imaging technology?

A) Brain scans can only be used to study abnormal brains.
B) Brain scans tell us what is happening, but not precisely where it is happening.
C) Imaging technology can mask the variability among people's brains.
D) It is not known how safe repeated usage of brain scans is for an individual.