Final answer:
The client's understanding is demonstrated by knowing the correct placement of the scopolamine patch behind the ear to prevent motion sickness and not daily replacement.
Step-by-step explanation:
The correct statement by the client that indicates an understanding of the teaching on scopolamine transdermal patches is d."I should place the patch behind my ear." This is because scopolamine patches are to be applied to the skin behind the ear to prevent motion sickness. It is important to note that the patch should not be replaced every day, but rather every three days unless otherwise instructed by a healthcare provider. The side effects of scopolamine can include dry mouth, dizziness, drowsiness, blurred vision, and urinary retention, but runny nose and diarrhea are not typically associated with its use as these symptoms suggest parasympathetic rather than sympathetic activity.