The Air Pressure P (H) (In Lb/ In ² )

The air pressure p (h) (in lb/ in ² ) at an altitude of h feet above sea level may be approximated by the formula At approximately what altitude h is the air pressure 11 lb/ in ² ?

A) 11,911 ft
B) 327 ft
C) 7,531 ft
D) 753 ft
E) 3,271 ft