A 33-year-old man is admitted to the hospital because of fever and chest pain, Crepitant crackles are heard in the left posterior lung base. Posterioanterior x rays of the chest show obliteration of the left hernidiaphragm by a water-density process, the left cardiac border is clearly visible Which of the following is the most likely location of the pathologic process? A) anterior segment of the left upper lobe B) Apicoposterior segment of the left supper lobe C) Interior angular segment of the left upper lobe 0) Superior ingular segment of the left upper lobe e)Left lower lobe