The Tails of a Distribution Are Asymptotic, Which Means That

The tails of a distribution are asymptotic, which means that the tails

A) touch the baseline at approximately five standard deviations from the mean.
B) curve upward from the baseline at approximately five standard deviations from the mean.
C) approach the baseline but never touch the baseline.
D) flatten out after approximately five standard deviations from the mean.