Final answer:
A population of tan-colored insects might evolve to be green through natural selection, where green insects survive better in a green plant environment, reproduce more, and pass the green trait to offspring.
Step-by-step explanation:
According to Darwin's ideas, a population of tan-colored insects might evolve to be green in color when inhabiting an area with green plants through natural selection. This process works as follows: if some insects are born with a green color due to genetic variation and mutations, and green coloration provides a camouflage advantage in a green environment, those insects are more likely to survive from predation. Therefore, they have more opportunities to reproduce and pass on their green color trait to their offspring. Over time, the frequency of green-colored insects increases in the population, which leads to a shift towards green coloration in the population.
The correct option that describes this process is c) Natural selection favors green-colored insects. Natural selection operates on the existing genetic variation within a population, where individuals with traits better suited to their environment tend to survive and reproduce, passing those advantageous traits on to the next generation, which can result in a population evolving over time.