Why Are Sensory Organs, Such as Eyes, Located on the Surface

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.