Final answer:
The most reasonable conclusion from the pattern in the chart is that the humidity has been steadily increasing.
Step-by-step explanation:
The pattern in the chart shows that the humidity increases over time. The humidity percentage goes from 65% at 3:00 pm to 89% at 3:45 pm, indicating a steady increase over the course of the observations. Therefore, the most reasonable conclusion Buzz can draw from this pattern is that the humidity has been steadily increasing.