How Can One Measure Intelligence? One Way Is to Measure

Multiple Choice

How can one measure intelligence? One way is to measure the size of the brain. New technology makes it possible to measure the volume of a person's brain in cubic inches without injury. What is more, the measurement gives close to the same answer when one repeats it. But how big the brain is has no relation to how smart a person is. As a measure of intelligence, brain volume is:

A) reliable but invalid.
B) valid but not reliable.
C) valid and reliable.
D) not reliable and invalid.