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To choose the correct medication, we must first understand the purpose and effects of each of the listed medications. A. Diphenhydramine (Benadryl) - Primarily used as an antihistamine for allergies, but also has some sedative effects. B. Lorazepam (Ativan) - A benzodiazepine known for its sedative, anxiolytic (anxiety-relieving), and muscle relaxant properties. C. Ciprofloxacin (Cipro) - An antibiotic used to treat bacterial infections. D. Propofol (Diprivan) - A sedative used for induction and maintenance of general anesthesia or sedation during procedures.

Next, we need to consider the primary concern, which is to ensure that the client can stay still during the procedure. A. Diphenhydramine (Benadryl) - Although it has sedative effects, it is not primarily used for this purpose, making it a less optimal choice. B. Lorazepam (Ativan) - With its sedative, anxiolytic, and muscle relaxant properties, this medication is a strong candidate for addressing the client's needs. C. Ciprofloxacin (Cipro) - This antibiotic would be irrelevant for the situation as there is no mentioned infection. D. Propofol (Diprivan) - This medication is commonly used for sedation during procedures; however, it typically requires close monitoring, and its use is not necessary for this case as the MRI is not an invasive procedure.

Based on the information about the medications and their suitability for fulfilling the client's need to stay still during the procedure, we can conclude that: The appropriate medication to be ordered is option B. Lorazepam (Ativan). This medication would help the client relax, reduce anxiety, and remain still during the MRI procedure.