Answer:
Positron emission tomography (PET).
Step-by-step explanation:
Positron emission tomography (PET) is an important test that determines the functioning of the tissues and organs of the body. The radioactive drug is used in this technique.
Ainsley ingests a tracer (radioactive drugs) to determine occipital cortex more active in response to moving versus stationary stimuli. She enters in the scanning machine, the PET imaging is helpful in this case a tracer has been used to diagnose the condition.
Thus, the correct answer is option (D).