The correct answer for the question that is being presented above is this one: "256 kpa." If a gas has a gage pressure of 156 kPa, its absolute pressure is approximately 256 kpa. Gauge pressure (GP) is 0 at atmospheric pressure (AP). Absolute pressure= GP + AP. Since atmospheric pressure is ca. 100 kpa; 100 + 156 is 256 kpa.
