A nurse is collecting data on a client following administration of an opioid narcotic. Which of the following findings indicates a decrease in the client's pain?

The correct answer is A: The client is asleep. When a client is asleep following the administration of an opioid narcotic, it indicates a decrease in pain because opioids can cause sedation as a side effect, leading to relief from pain. Sleep is a common response to decreased pain levels due to the central nervous system depression caused by opioids. Elevated blood pressure (B) and increased respiratory rate (C) are not indicative of decreased pain but could be signs of opioid overdose or inadequate pain management. Diaphoresis (D) may indicate pain or withdrawal symptoms but does not directly indicate a decrease in pain.