What is most likely the explanation of the data shown below?

data table

Question 2 options:

There has been a drought in the area that is affecting all life forms.

The population of natural predators of the moths has gotten smaller.

The moths are living in an environment with light trees.

The moths are living in an environment with dark trees.

It is not possible to determine the most likely explanation of the data shown below without the actual data or any additional context.