The Critical T-Value Represented by T₀

Multiple Choice

The critical t-value represented by t_{0.025(2) ,20} is the one appropriate for which combination of critical value and degrees of freedom?

A) A 5% critical value and 19 degrees of freedom.
B) A 5% critical value and 20 degrees of freedom.
C) A 2.5% critical value and 19 degrees of freedom.
D) A 2.5% critical value and 20 degrees of freedom.