In European earwigs, the males sometimes have long pincers protruding from the end of their abdomens, as shown in the accompanying photo.

In graphs (a)-(c), we have plotted three frequency distributions of sample means of pincer lengths (in millimeters) based on random samples from an earwig population. One of the distributions shows means of samples based on n=1, one shows means of samples based on n=2, and one shows means of samples based on n-8.n = 8. Identify which frequency distribution corresponds to each sample size. Explain the basis for your decisions.