The answer is C. bc opioids are stimulants that stimulate something that other Opioids won't. <span />
The correct answer is A.
Q: But how, also, why?
A:

Formula to the solution should explain everything. ^
CT scans provide doctors with more information than an X-ray. The doctor is able to see the ample data in various different views unlike an X-ray which only gives you limited information.