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ANSWER: B. 50,000 Pa
In manometers filled with mercury (Hg), the difference in height of the fluid is equivalent to the difference in pressure. There is a difference in 380mmHg between the pressure inside and outside, which is half of the atmospheric pressure of 760mmHg, or 1 atm. 1 atm is roughly 100,000 Pa, so the pressure inside is 50,000 Pa.