A 60-year-old man has long managed his type 1 diabetes effectively with a combination of vigilant blood sugar monitoring, subcutaneous insulin administration, and conscientious eating habits. This morning, however, his wife has noted that he appears pale and clammy and appears to be in a stupor, though he is responsive. She suspects that he has made an error in his insulin administration and that he is experiencing a hypoglycemic episode. Which of the following actions should be the wife's first choice?
A) Administration of 15 to 20 g of glucose in a concentrated carbohydrate source
B) Administration of subcutaneous glucagon
C) IV infusion of 50% dextrose and water solution
D) Careful monitoring for level of consciousness and resolution of hypoglycemia