The answer is B.He wants to emphasize the idea that the world is too modern to let living things go freely.He is afraid that technology and the greed of men are working against nature .He does not like the idea of men ruling the world with new resources .The image of the shadow also suggests that he sees something wrong with modern gadgets and machines. A shadow in the scene that affects the flow of fish in the sea is seen as a negative response to modern inventions.