Final answer:
The most appropriate nursing intervention is to encourage the client to eat a meal or snack containing carbohydrates.
Step-by-step explanation:
The most appropriate nursing intervention in this case would be to encourage the client to eat a meal or snack containing carbohydrates (option 2). The decreased level of consciousness and low glucose level indicate that the client is experiencing hypoglycemia, which is a medical emergency. Providing the client with food or drink that contains carbohydrates such as juice, crackers, or a sandwich can quickly raise their blood glucose level and help improve their consciousness.