In viruses, bacteria, and single-cell eukaryotes, mutation rates typically decrease with genome size. However, in multicellular eukaryotes, mutation rates tend to increase with genome size. Which of the following ideas best explains this pattern?
A. Genetic drift is more powerful at large effective population sizes
B. Natural selection is more effective at large effective population sizes
C. There are higher rates of migration between microbial populations
D. Transposable elements often decrease mutation rates