Observe the map of the United States above. Areas indicated in red are where tornadic activity is most likely. Which explanation BEST describes why these areas are most impacted by tornadoes?​

Which statement about variation is true? a) all phenotypic variation is the result of genotypic variation.b) all genetic variation produces phenotypic variation.c) all nucleotide variability results in neutral variation.d) all new alleles are the result of nucleotide variability.e) all geographic variation results from the existence of clines.