OE


This sentence is saying that very different conditions can be misdiagnosed because there is "something" about the differences in their symptoms that cause them to be confused. This "something" must be a vagueness that renders them easily confused. "Pervasiveness" means prevalence. The amount of the symptoms wouldn't hinder a doctor's ability to differentiate between them. "Harmless" means non-threatening. The harmlessness of the differences wouldn't affect a doctor's ability to differentiate between symptoms, either. "Debilitating" means incapacitating. If the differences were debilitating it would actually make proper diagnosis easier because they would have such different effects on a patient. "Extravagant" means excessive. Again, excessive differences would make proper diagnosis easier. We want differences that are hard to notice. That leaves us with "Inconspicuous" and "Subtler These both mean difficult to locate. Differences in symptoms that follow these two descriptions would, in fact, be difficult to spot and would lead to misdiagnosis. a and e are correct.