Biologist: Marine animals known as box jellyfish have eyes with well-formed lenses capable of producing sharp images that reveal fine detail. But the box jellyfish' s retinas are too far forward to receive a clear image, so these jellyfish can receive only a blurry image that reveals prominent features of objects but not fine detail. This example shows that eyes are adapted only to an animal' s needs rather than to some abstract sense of how a good eye would be designed. The argument requires assuming which one of the following? ['Box jellyfish developed from jellyfish whose retinas received clear images.', 'Box jellyfish have a need to detect prominent features of objects but not fine details.', 'Box jellyfish would benefit from having retinas that allowed their eyes to focus more sharply.', 'Box jellyfish use vision as their main means of detecting prey.']