Although Their Formulas Are Similar, One Difference Between the Z-Score

Although their formulas are similar, one difference between the z-score (z) and the t-statistic (t) is that ______.

A) only z-scores (not t-statistics) are part of a theoretical distribution
B) z-scores evaluate sample means whereas t-statistics evaluate individual scores
C) the numerator of the t-statistic formula (not the z-score) is the difference between a score and a mean
D) the denominator of the t-statistic formula estimates the variability of sample means rather than individual scores