Answer:
Step-by-step explanation:
There is no way that it is just a coincidence the way the two lines line up almost perfectly is and it would make sense because if people are buying sun glasses and going surfing with them at the beach and it would probably obscure their vision so i believe its not a coincidence it is just statistics proving the theory correct.
i would say that this is definitely causation as in the more people buy sun glasses the more people have accidents while surfing because of obscured vision. you would probably have to look more itno the stats to fully prove it but i believe its is a direct causation.