Why are sensory organs, such as eyes, located on the surface of the body?

A)Their location is adaptive; it allows sensory organs to receive input from the environment.
B)Their location is adaptive; it allows sensory organs to receive input from the central nervous system.
C)Their location is an artifact of development; these structures are derived from mesoderm.
D)Their location is an artifact of development; these structures are derived from endoderm.
E)None of the answer options is correct; there is a better explanation that is not listed.