One major reason that the twosample t procedures are widely

One major reason that the two-sample t procedures are widely used is that they are quite robust.
This means that

$\"One$

A.	t procedures do not require that we know the standard deviations of the populations.
B.	confidence levels and P-values from the t procedures are quite accurate even if the population distribution is not exactly Normal.
C.	t procedures compare population means, a comparison that answers many practical questions.

An appropriate answer is option (c).

t procedures compare population means, a comparison that answers many practical questions.