Final answer:
A Certified Therapeutic Recreation Specialist (CTRS) should rely on the Medical Chart for assessing a client with dementia and expressive aphasia after a CVA, as it provides essential medical history and treatment information.
Step-by-step explanation:
When a Certified Therapeutic Recreation Specialist (CTRS) is unable to collect background information from a client with dementia and expressive aphasia due to a recent cerebrovascular accident (CVA), the resource they should use for the assessment is A. Medical Chart. This tool contains vital information about the patient's medical history, current condition, and the treatments they are receiving. Family reports, observations of cognitive abilities, and participation in activities can supplement the medical chart, but the medical chart provides the essential baseline data necessary for developing a tailored therapeutic plan. Using the Medical Chart may not be as effective since it may not accurately reflect the client's current abilities and limitations, and Family reports may be limited by the client's expressive aphasia.