R.V. is a 28-year-old HIV-positive man recently hospitalized for evaluation of symptoms of progressive weakness, dyspnea, weight loss, and low-grade fever. A biopsy of R.V.'s lung tissue reveals Pneumocystis carinii pneumonia. This diagnosis means that R.V. A) has AIDS. B) has less than 2 years to live. C) cannot be treated. D) was an intravenous drug abuser.