[单选题]
2. What is the role of muta:f pa oym h(63lf*45wixkai( ctionh +e y4/-ry9c w*r( kemxlnlk5 in a population?
A. It creates individuals with a better chance of survival.
B. It damages the chance of survival of individuals.
C. It has no effect.
D. It creates genetic variation within the population.