The evolution of organisms such as humans occurs on a scale of millions of years. In contrast, within 1 year of its introduction for clinical use, methicillin resistance was reported in S. aureus. Why
a. The selective pressure imposed by antibiotics accelerates microbial evolution
b. S. aureus naturally develops resistance rapidly
c. Humans evolve faster than bacteria due to their complex biology
d. Methicillin resistance is not a result of evolutionary processes