The correct statement is: D.Wildfires caused a decrease in ground cover, which in turn caused a decrease in soil temperatures leading to later emergence of cicadas.
A wildfire can be defined as unexpected fire that affect a forest area or grassland area and they are difficult to quench because the fire spread very fast.
When their is reduction in ground cover due to wildfire outbreak this tend to lower or reduce soil temperatures leading to cicadas based on the fact that cicada are tied to temperature.
Therefore the correct statement is: D.
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