Nina's Doctor Suggested That, Instead of Her Annual X-Ray Mammogram

Nina's doctor suggested that, instead of her annual X-ray mammogram, she will have an MRI exam. How should Nina respond? She

A) should toss a coin; both are equally good.
B) can be confident that her doctor is recommending a valuable, up-to-date procedure.
C) should inquire further to make sure that this is not a managed care attempt at cost cutting.
D) should inquire further, because MRI is more expensive and adds little diagnostic value.