Final answer:
The NA should assist with comfort measures, such as repositioning.
Step-by-step explanation:
The best response by the NA if a resident with cancer is experiencing pain would be (A) The NA should assist with comfort measures, such as repositioning. This is because pain management is an important aspect of care for cancer patients and helping the resident find a more comfortable position can provide relief. It is crucial to prioritize the resident's comfort and well-being.
Learn more about Managing pain in cancer patients