A Dictator Has Built a Bunker for His Use in Emergencies

A dictator has built a bunker for his use in emergencies. Its dimensions are shown below. When it floods to ground level during a tropical storm, air is trapped above the dashed line in the bunker.
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Use this exhibit to answer the following question(s) .
-The gauge pressure at point A, in Pa, is

A) 3.92 × 10⁵.
B) 4.90 × 10⁵.
C) 5.39 × 10⁵.
D) 5.88 × 10⁵.
E) 6.89 × 10⁵.