Why Aren't Organisms Perfectly Adapted to Their Environments

Multiple Choice

Why aren't organisms perfectly adapted to their environments?

A) There are physical constraints that cannot be overcome.
B) An organism's surroundings do not present a stationary target to which natural selection can optimize its phenotype.
C) The process of natural selection lacks foresight.
D) All of the above
E) None of the above; some organisms are perfectly adapted to their environments.