Answer:
Oprion B is correct
12.8 mmHg
Explanations:
Fall in the atmospheric pressure (in mb) in 1 hour= 3.4 mb
1013 mb = 760 mmHg
1 mb = 760 /1013 mmHg
1 mb = 0.75025 mmHg
Fall in the atmospheric pressure (in mmHg) in 1 hour = 3.4 x 0.75025
Fall in the atmospheric pressure (in mmHg) in 1 hour = 2.55085 mmHg
Drop in atmospheric pressure, in millimeters of mercury (mm Hg), over the course of 5 hours = 2.55085 x 5
Drop in atmospheric pressure, in millimeters of mercury (mm Hg), over the course of 5 hours = 12.75 mmHg
Drop in atmospheric pressure, in millimeters of mercury (mm Hg), over the course of 5 hours =12.8 mmHg (rounded to 1 decimal place)