To determine what happened as Trevor observed the change in air pressure, we need to consider how air pressure systems typically behave:
- A drop in air pressure usually indicates that a low pressure system is approaching, which is often associated with stormy or rainy weather.
- Conversely, an increase in air pressure is typically associated with a high pressure system moving into the area, which generally brings clearer and calmer weather.
Without specific details about whether the pressure was rising or falling, it is a bit ambiguous. However, if we assume that the barometer showed a significant change from a higher pressure reading to a lower pressure reading, then the correct answer would be:
B. A high pressure system turned into a low pressure system.
If the barometer showed an increase in pressure, then the correct answer would be:
C. A high pressure system moved into the area.
If Trevor saw a drop, indicating an incoming low pressure system, it would be:
D. A low pressure system moved into the area.
Please clarify the direction of the change in air pressure for a more accurate answer.