Which of the following is NOT an important reason that natural selection does not lead to perfect organisms?
A) Environments change quickly; natural selection may be too slow to adapt an organism in a population to the constantly "moving target" of the environment.
B) Variation is created by random processes and natural selection can only "work" with the variations that show up.
C) There are often multiple alleles for a trait; each allele may represent an equally fit "solution" to the challenges of the environment.
D) All of the above are important reasons that natural selection does not lead to perfect organisms.
E) None of the above is an important reason explaining why natural selection does not lead to perfect organisms.