All artificial reefs serve a main purpose of improving the abundance and diversity
of life in the ocean.

the platforms age, the populations of fish and other marine organisms that live near the structure increase. ... Artificial reefs provide shelter, food and other necessary elements for biodiversity and a productive ocean. This in turn creates a rich diversity of marine life, attracting divers and anglers.

Explanation:

i'm pretty sure the answer would be

c. england

hope this best of luck sorry if i'm wrong

~animaljamissofab ♥

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.