Answer:
B. The color of the surroundings changed.
Step-by-step explanation:
Based on the information provided, the most likely explanation for the change in the coloration of the insects over time is that the color of the surroundings changed. The data in the graph shows that the number of insects with lighter coloration increased between the first and second observations, which suggests that the insects may have adapted to better blend in with their surroundings. This could be due to a change in the color of the environment, such as an increase in the amount of light or a change in the predominant colors in the area. Option B, "The color of the surroundings changed," is therefore the most likely explanation for the observed change in the insects' coloration.