Final answer:
The nursing assistant should express empathy and understanding for the resident's feelings of envy and depression.
Step-by-step explanation:
In response to the resident's expression of envy and depression, the nursing assistant should select option A) Express empathy and understanding for the resident's feelings. This is important because it shows compassion and acknowledges the resident's emotions. The nursing assistant can say something like, 'I understand that it can be difficult seeing others in good health when you're feeling down. Is there anything I can do to support you during this time?' This would help create a safe and supportive environment for the resident.