Which statement best explains how natural selection determines differential survival when a population is under resource stress? a. individuals with favorable traits are more likely to survive and reproduce than those with less favorable traits. b. groups of individuals whose traits are very similar are more likely to survive and reproduce than groups whose individuals are genetically diverse. c. groups whose individuals are generalists are more likely to survive and reproduce than groups of individuals who are specialists. d. individuals who possess more common genotypes are more likely to survive and reproduce than those who possess rarer genotypes.