Without seeing the specific artwork or knowing more about the artist's intent, it's challenging to determine the exact message. However, if the artwork features elements commonly associated with oil spills, pollution, or environmental themes, it's likely that the artist is communicating "the concern of oil use on the environment." If the artwork depicts images related to sunlight or shadows, then it could be addressing the "lack of sunlight in some areas of the world." The same goes for the other options, depending on visual clues present in the work.
To make the best choice, consider the prevalent themes or imagery in the artwork to discern which message aligns most closely with what is represented.