A 35-year-old woman consults an ophthalmologist because of double vision and droopy eyelids. She also has complaints of generalized muscle weakness. IV injection of edrophonium dramatically, but only briefly, reverses her symptoms. This patient’s probable disease has a pathophysiologic basis that is closest to that of which of the following conditions?
A. Bullous pemphigoid
B. Diabetes mellitus type 1
C. Idiopathic Addison disease
D. Insulin resistance
E. Systemic lupus erythematosus