Final answer:
If a client has a sore or injured back, you should not perform the test, prioritizing their safety and considering alternative assessments or postponement.
Step-by-step explanation:
Before assessing your client, if they indicate that they have a sore or injured back, the correct response is that you should not perform the test. This is because conducting an assessment on someone with a potentially serious condition could exacerbate their injury and is contraindicated in the presence of acute pain or injury. As a health professional, the safety and well-being of the client should always be the top priority. Therefore, alternative methods of assessment should be considered, or the test should be postponed until the client has been cleared by a medical professional.