You are caring for a 68-year-oldmale who has copious amounts of fluid in the left pleural cavity due to acute pleurisy. When you exam him as he sitsup in  bed (trunk upright), where wouldthe fluid tend to accumulate?
A、   costodiaphragmaticrecess
B、costomediastinalrecess
C、  cupola
D、  hilarreflection
E、 middlemediastinum