Why Does Correcting the Standard Deviation to Account for Error

Multiple Choice

Why does correcting the standard deviation to account for error in a t test make a much bigger difference for small samples than it does for larger ones?

A) We subtract 1 from the sample size, which removes a greater proportion of the total and corrects to a greater degree for smaller sample sizes compared to larger ones.
B) Small samples are biased.
C) We add 1 to the sample size, which removes a greater proportion of the total for smaller sample sizes compared to larger ones.
D) Large samples are biased.