Which of the Following Reasons Is a Primary Disadvantage That

Which of the following reasons is a primary disadvantage that CT scans have over MRI, fMRI, and dMRI?

A) CT scans only show structure whereas MRI, fMRI, and dMRI are all methods that allow researchers to examine brain activation.
B) CT scans uses X-rays and expose participants to radiation.
C) CT scans are better for examining research questions about timing whereas MRI, fMRI, and dMRI look at brain regions.
D) CT scans are only usable on adults, whereas MRI, fMRI, and dMRI can be used effectively as early as infancy.