Final answer:
Amoxapine, being closely related to antipsychotics and capable of blocking dopamine receptors, is the medication most likely to cause parkinsonian symptoms among the provided options.
Step-by-step explanation:
The medication most likely to cause parkinsonian symptoms among the options provided is B. Amoxapine.
Amoxapine, an antidepressant of the dibenzoxazepine class, is closely related to the antipsychotics and can block dopamine receptors, potentially leading to symptoms such as tremors and rigidity that are similar to those seen in Parkinson's disease.
Parkinsonian symptoms are caused by the degeneration of neurons that release dopamine, and drugs that block dopamine receptors can produce similar effects.