Research Has Shown Which of the Following to Be True

Research has shown which of the following to be true about medical technology (e.g., MRIs) ?

A) Doctors in the U.S. underutilize medical technology.
B) European and Canadian patients actually experience smaller wait times for medical technology.
C) Doctors in the U.S. often order tests because patients want them, not because they are medically necessary.
D) The U.S. has a high demand for medical technology because it has relatively few of machines capable of performing these tests.