Answer:
Darker colouring is currently better for the peppered moth's survival.
Step-by-step explanation:
This is because the dark-coloured moths were able to blend in better as the environment around them shifted. This helped them survive and for their genes to be passed on. The other options are wrong because colour did play a role in the percentage of differently coloured moths in the environment, there previously were dark-coloured moths, just not in as much abundance, and the lighter-peppered moths did not go to a new environment, they just got found and eaten quicker in their current one.