Survival of at least a few members of a population
after a major environmental change is most dependent
on
A) the population having an individual that is
adapted to the original environment
B) the population having an individual that is
adapted to great changes in the temperature in its
environment
C) variations in many different traits in many
individuals in the population
D) no variations in the color of the fur, skin, or
feathers of the individuals in the population

i know its C but why is that?​