A tropical area has a drought (lower than normal rainfall) for 10 years in a row. Insects that have adaptations for dry conditions now have a larger population size than other insects. Which of the following statements best explains the increase in the population of the insects?
a. Diversity of insects increased due to the dry conditions
b. Insects with adaptations for dry conditions have migrated out of the region
c. Natural selection has favored insect species with adaptations for dry conditions
d. Natural selection has selected against insect species that are adapted for dry conditions