A) Bilaterally symmetric and located vertically in the thoracic cavity B) Thicker on the left and located obliquely in the thorax with its apex on the left C) Bilaterally symm etric but located obliquely in the thorax with its apex on the left D) Thicker on the right and located obliquely in the thorax with its apex on the right E) Thicker on the left and located obliquely in the thorax with its apex on the right